INDUSTRY INSIGHTS YOUR PEERS ARE READING
Last week we learned about the [increased tail-latency sensitivity of microservices based applications with high RPC fan-outs. Seer uses estimates of queue depths to mitigate latency spikes on the order of 10-100ms, in conjunction with a cluster manager. MORE
java performance scalability latency cpu grpc rpc qpsAlmost every time I present RSocket to an audience, there will be someone asking the question: "How does RSocket compare to gRPC?" " Today we are going to find out. MORE
Tue-Thu Apr 25-27: High-Performance and Low-Latency C++ (Stockholm). On April 25-27, I’ll be in Stockholm (Kista) giving a three-day seminar on “High-Performance and Low-Latency C++.” This intensive three day course will provide developers with the knowledge and skills required to write high-performance and low-latency code on today’s modern systems using modern C++11/14/17. MORE
The canary stage will determine a score based on metrics such as CPU, threads, latency, and GC pauses. Baking Windows with Packer By Justin Phelps and Manuel Correa Customizing Windows images at Netflix was a manual, error-prone, and time consuming process. MORE
Today we are excited to announce latency heatmaps and improved container support for our on-host monitoring solution?—?Vector?—?to Remotely view real-time process scheduler latency and tcp throughput with Vector and eBPF What is Vector? MORE
Citrix platform performance—optimize your Citrix landscape with insights into user load and screen latency per server. Citrix latency represents the end-to-end “screen lag” experienced by a server’s users. ICA latency. Dynatrace news. MORE
In ProtoCache (a component of a widely used Google application), 27% of its latency when using a traditional S+RInK design came from marshalling/un-marshalling. (We’ve The network latency of fetching data over the network, even considering fast data center networks. MORE
Every new origin we need to visit needs a connection opening, and that can be very costly: DNS resolution, TCP handshakes, and TLS negotiation all add up, and the story gets worse the higher the latency of the connection is. MORE
Step 5 – xMatters triggers a runbook in Ansible to fix the disk latency. As a last step, xMatters triggers a runbook in Ansible to push the disk latency fix. Dynatrace news. MORE
That’s hard for many reasons, including the differing trade-offs between throughput and latency that need to be made across the use cases. Oh, and in additional to low latency, “ we require access to fresh data.” MORE
While DynamoDB already allows you to perform low-latency queries based on your tableâ??s This gives you the ability to perform richer queries while still meeting the low-latency demands of responsive, scalable applications. All Things Distributed. MORE
How many buffers are needed to track pending requests as a function of needed bandwidth and expected latency? Can one both minimize latency and maximize throughput for unscheduled work? Recall that latency —in units of time—is the time it takes to do a task (e.g., MORE
This week I updated three of those posts — two really old ones (primarily of interest to computer architecture historians), and one from 2018: July 2012: Local and Remote Memory Latency on AMD Processors in 2-socket and 4-socket servers. Computer Architecture Performance memory bandwidth memory latency Xeon PhiAs part of my attempt to become organized in 2019, I found several draft blog entries that had never been completed and made public. MORE
It was made possible by using a low latency of 0.1 seconds, the lower the latency, the more responsive the robot. Wake up! It's HighScalability time: 10 years of AWS architecture increasing simplicity or increasing complexity? Michael Wittig ). Do you like this sort of Stuff? MORE
To deliver the real-time performance expected from Uber’s users, our mobile apps require low-latency and highly … The post Employing QUIC Protocol to Optimize Uber’s App Performance appeared first on Uber Engineering Blog. Uber operates on a global scale across more than 600 cities, with our apps relying entirely on wireless connectivity from over 4,500 mobile carriers. MORE
SLOG: serializable, low-latency, geo-replicated transactions Ren et al., That’s where SLOG (Serializable LOw-latency, Geo-replicated transactions) comes in. VLDB’19. SLOG is another research system motivated by the needs of the application developer (aka, user!). MORE
How many buffers are needed to track pending requests as a function of needed bandwidth and expected latency? Can one both minimize latency and maximize throughput for unscheduled work? Let L denoted the average total latency to handle a task, equal to Q + S. Low latency ? MORE
Japanese companies and consumers have become used to low latency and high-speed networking available between their businesses, residences, and mobile devices. The advanced Asia Pacific network infrastructure also makes the AWS Tokyo Region a viable low-latency option for customers from South Korea. All Things Distributed. Werner Vogels weblog on building scalable and robust distributed systems. Expanding the Cloud - Introducing the AWS Asia Pacific (Tokyo) Region. MORE
I work quickly on my computer and I get frustrated when I am forced to wait on an operation that should be fast. A persistent nuisance on my over-powered home laptop is that closing windows on the taskbar is slow. I right-click on an entry, wait for the menu to appear, and then select “Close window”. MORE
The first—and often most surprising for people to learn—thing that I want to draw your attention to is that TTFB counts one whole round trip of latency. The reason is because mobile networks are, as a rule, high latency connections. MORE
The Xeon Phi x200 (Knights Landing) has a lot of modes of operation (selected at boot time), and the latency and bandwidth characteristics are slightly different for each mode. It is also important to remember that the latency can be different for each physical address, depending on the location of the requesting core, the location of the coherence agent responsible for that address, and the location of the memory controller for that address. MCDRAM maximum latency (ns) 156.1 MORE
Computer Architecture Computer Hardware Performance cache DRAM high performance computing memory bandwidth memory latency STREAM benchmark“Memory Bandwidth and System Balance in HPC Systems” If you are planning to attend the SuperComputing 2016 conference in Salt Lake City next month, be sure to reserve a spot on your calendar for my talk on Wednesday afternoon (4:15pm-5:00pm). MORE
Things always always feel fast when we’re developing because, more often than not, we’re working on high-spec machines on dedicated networks, and also serving from localhost which removes the bulk of the latency and bandwidth issues that a real user would suffer. MORE
Because microprocessors are so fast, computer architecture design has evolved towards adding various levels of caching between compute units and the main memory, in order to hide the latency of bringing the bits to the brains. MORE
When it comes to network performance, there are two main limiting factors that will slow you down: bandwidth and latency. Latency is defined as…. Where bandwidth deals with capacity, latency is more about speed of transfer 2. and reduction in latency. more than latency. MORE
If, however, there wasn’t a new file on the server, we’ll bring back a 304 header, no new file, but an entire roundtrip of latency. We can completely cut out the overhead of a roundtrip of latency. This means no unnecessary roundtrips spent retrieving 304 responses, which potentially saves us a lot of latency on the critical path ( CSS blocks rendering ). On high latency connections, this saving could be tangible. MORE
From 11:48 to 12:10 latency for at least 50% of requests was significantly higher from us-east1 and us-central1 to GCS regional buckets in us-east1, us-central1, and europe-west2. From 11:48 to 12:03 latency was also elevated for europe-west2 to europe-west2 regional bucket access. MORE
This new Region consists of multiple Availability Zones and provides low-latency access to the AWS services from for example the Bay Area. All Things Distributed. Werner Vogels weblog on building scalable and robust distributed systems. MORE
Although this response has a 0B filesize, we will always take the latency hit on every single page view (and this response is basically 100% latency). com , which introduces yet more latency for the connection setup. MORE
However, there is excitement around Starlink for other reasons – namely, the implications it might have for internet speed and latency – even by just a small amount (20 milliseconds on average). Starlink’s Goal: Reduce Internet Latency. Elon Musk’s need for speed. MORE
The paper examines the implications of microservices at the hardware, OS and networking stack, cluster management, and application framework levels, as well as the impact of tail latency. The bottom line shows the tail latency impact in the microservices-based applications. MORE
cpupower frequency-info analyzing CPU 0: driver: intel_pstate CPUs which run at the same hardware frequency: 0 CPUs which need to have their frequency coordinated by software: 0 maximum transition latency: Cannot determine or is not supported. MORE
Making queries to an inference engine has many of the same throughput, latency, and cost considerations as making queries to a datastore, and more and more applications are coming to depend on such queries. A case for managed and model-less inference serving Yadwadkar et al., HotOS’19. MORE
Prediction serving latency matters. Lesson 4: prediction serving latency matters. In a experiment introducing synthetic latency, Booking.com found that an increase of about 30% in latency cost about 0.5% MORE
To accomplish this, Uber relies heavily on making data-driven decisions at every level, from forecasting rider demand during high traffic events to identifying and addressing bottlenecks … The post Uber’s Big Data Platform: 100+ Petabytes with Minute Latency appeared first on Uber Engineering Blog. Uber is committed to delivering safer and more reliable transportation across our global markets. MORE
The performance consists of two aspects: throughput and latency. Humans will wait much longer than an API will since APIs have strict latency expectations due to timeouts. But in most cases in modern applications, the application expectation is far less than the baked-in latency. MORE
This data-propagation latency was unacceptable?—?we The Tangible Result With the data propagation latency issue solved, we were able to re-implement the Gatekeeper system to eliminate all I/O boundaries. MORE
While there is plenty of well-documented benefits to using a connection pooler, there are some arguments to be made against using one: Introducing a middleware in the communication inevitably introduces some latency. MORE
Unfortunately, this means that the age-old Telco bugbears will rear their ugly heads again, including latency. 5G, as a fundamental requirement, mandates a 1 millisecond latency from the datasource to its destination. With the 5G revolution, operators will need to manage hundreds of edge deployments, and maintain the physical space and hardware to achieve 1ms of latency. This requires 1 ms network latency. MORE
No Compromises Performance Personalization Real-time Vlog low latency real-time analytics telco telco strategy telecomHistorically, telco analytics have been limited and difficult. Telco networks and the systems that support those networks are some of the most advanced technology solutions in existence. MORE
Two failure modes we focus on are a service becoming slower (increase in response latency) or a service failing outright (returning errors). If you’ve read the SRE book you’ve probably come across the “four golden signals” (p60): latency, throughput, error rate, and saturation. MORE
In addition, compute and storage are increasingly being separated causing larger latencies for queries. The Apache Spark + Alluxio stack is getting quite popular particularly for the unification of data access across S3 and HDFS. Alluxio is leveraged as compute-side virtual storage to improve performance. But to get the best performance, like any technology stack, you need to follow the best practices. MORE
AWS customers can now use this Region to serve their end users in Hong Kong SAR at a lower latency, and to comply with any data locality requirements. Today, I am happy to introduce the new AWS Asia Pacific ( Hong Kong ) Region. MORE
Latency Related Topics Randon ASCII
SEPTEMBER 8, 2019
I work quickly on my computer and I get frustrated when I am forced to wait on an operation that should be fast. A persistent nuisance on my over-powered home laptop is that closing windows on the taskbar is slow. I right-click on an entry, wait for the menu to appear, and then select “Close window”.
CSS Wizardry
JANUARY 31, 2019
When it comes to network performance, there are two main limiting factors that will slow you down: bandwidth and latency. Latency is defined as…. Where bandwidth deals with capacity, latency is more about speed of transfer 2. and reduction in latency. more than latency.
The Morning Paper
SEPTEMBER 3, 2019
SLOG: serializable, low-latency, geo-replicated transactions Ren et al., That’s where SLOG (Serializable LOw-latency, Geo-replicated transactions) comes in. VLDB’19. SLOG is another research system motivated by the needs of the application developer (aka, user!).
Uber Engineering
OCTOBER 17, 2018
To accomplish this, Uber relies heavily on making data-driven decisions at every level, from forecasting rider demand during high traffic events to identifying and addressing bottlenecks … The post Uber’s Big Data Platform: 100+ Petabytes with Minute Latency appeared first on Uber Engineering Blog. Uber is committed to delivering safer and more reliable transportation across our global markets.
Scalegrid
OCTOBER 17, 2019
While there is plenty of well-documented benefits to using a connection pooler, there are some arguments to be made against using one: Introducing a middleware in the communication inevitably introduces some latency.
DZone
JUNE 2, 2019
java performance scalability latency cpu grpc rpc qpsAlmost every time I present RSocket to an audience, there will be someone asking the question: "How does RSocket compare to gRPC?" " Today we are going to find out.
John McCalpin
DECEMBER 6, 2016
The Xeon Phi x200 (Knights Landing) has a lot of modes of operation (selected at boot time), and the latency and bandwidth characteristics are slightly different for each mode. It is also important to remember that the latency can be different for each physical address, depending on the location of the requesting core, the location of the coherence agent responsible for that address, and the location of the memory controller for that address. MCDRAM maximum latency (ns) 156.1
VoltDB
JUNE 19, 2017
Unfortunately, this means that the age-old Telco bugbears will rear their ugly heads again, including latency. 5G, as a fundamental requirement, mandates a 1 millisecond latency from the datasource to its destination. With the 5G revolution, operators will need to manage hundreds of edge deployments, and maintain the physical space and hardware to achieve 1ms of latency. This requires 1 ms network latency.
CSS Wizardry
MAY 31, 2019
Every new origin we need to visit needs a connection opening, and that can be very costly: DNS resolution, TCP handshakes, and TLS negotiation all add up, and the story gets worse the higher the latency of the connection is.
John McCalpin
JANUARY 9, 2019
This week I updated three of those posts — two really old ones (primarily of interest to computer architecture historians), and one from 2018: July 2012: Local and Remote Memory Latency on AMD Processors in 2-socket and 4-socket servers. Computer Architecture Performance memory bandwidth memory latency Xeon PhiAs part of my attempt to become organized in 2019, I found several draft blog entries that had never been completed and made public.
John McCalpin
OCTOBER 16, 2016
Computer Architecture Computer Hardware Performance cache DRAM high performance computing memory bandwidth memory latency STREAM benchmark“Memory Bandwidth and System Balance in HPC Systems” If you are planning to attend the SuperComputing 2016 conference in Salt Lake City next month, be sure to reserve a spot on your calendar for my talk on Wednesday afternoon (4:15pm-5:00pm).
VoltDB
JUNE 9, 2017
No Compromises Performance Personalization Real-time Vlog low latency real-time analytics telco telco strategy telecomHistorically, telco analytics have been limited and difficult. Telco networks and the systems that support those networks are some of the most advanced technology solutions in existence.
CSS Wizardry
AUGUST 7, 2019
The first—and often most surprising for people to learn—thing that I want to draw your attention to is that TTFB counts one whole round trip of latency. The reason is because mobile networks are, as a rule, high latency connections.
All Things Distributed
APRIL 17, 2013
While DynamoDB already allows you to perform low-latency queries based on your tableâ??s This gives you the ability to perform richer queries while still meeting the low-latency demands of responsive, scalable applications. All Things Distributed.
Dynatrace
SEPTEMBER 25, 2019
Citrix platform performance—optimize your Citrix landscape with insights into user load and screen latency per server. Citrix latency represents the end-to-end “screen lag” experienced by a server’s users. ICA latency. Dynatrace news.
The Netflix TechBlog
FEBRUARY 20, 2019
Today we are excited to announce latency heatmaps and improved container support for our on-host monitoring solution?—?Vector?—?to Remotely view real-time process scheduler latency and tcp throughput with Vector and eBPF What is Vector?
MachMetrics
OCTOBER 16, 2019
However, there is excitement around Starlink for other reasons – namely, the implications it might have for internet speed and latency – even by just a small amount (20 milliseconds on average). Starlink’s Goal: Reduce Internet Latency. Elon Musk’s need for speed.
The Morning Paper
MAY 19, 2019
Last week we learned about the [increased tail-latency sensitivity of microservices based applications with high RPC fan-outs. Seer uses estimates of queue depths to mitigate latency spikes on the order of 10-100ms, in conjunction with a cluster manager.
SQL Shack
JULY 10, 2019
TempDB is one of the biggest sources of latency in […]. Introduction In-memory technologies are one of the greatest ways to improve performance and combat contention in computing today.
CSS Wizardry
AUGUST 13, 2019
Although this response has a 0B filesize, we will always take the latency hit on every single page view (and this response is basically 100% latency). com , which introduces yet more latency for the connection setup.
ACM Sigarch
MARCH 18, 2019
How many buffers are needed to track pending requests as a function of needed bandwidth and expected latency? Can one both minimize latency and maximize throughput for unscheduled work? Recall that latency —in units of time—is the time it takes to do a task (e.g.,
ACM Sigarch
MARCH 25, 2019
How many buffers are needed to track pending requests as a function of needed bandwidth and expected latency? Can one both minimize latency and maximize throughput for unscheduled work? Let L denoted the average total latency to handle a task, equal to Q + S. Low latency ?
The Netflix TechBlog
JUNE 4, 2019
Because microprocessors are so fast, computer architecture design has evolved towards adding various levels of caching between compute units and the main memory, in order to hide the latency of bringing the bits to the brains.
All Things Distributed
MARCH 2, 2011
Japanese companies and consumers have become used to low latency and high-speed networking available between their businesses, residences, and mobile devices. The advanced Asia Pacific network infrastructure also makes the AWS Tokyo Region a viable low-latency option for customers from South Korea. All Things Distributed. Werner Vogels weblog on building scalable and robust distributed systems. Expanding the Cloud - Introducing the AWS Asia Pacific (Tokyo) Region.
All Things Distributed
DECEMBER 3, 2009
This new Region consists of multiple Availability Zones and provides low-latency access to the AWS services from for example the Bay Area. All Things Distributed. Werner Vogels weblog on building scalable and robust distributed systems.
CSS Wizardry
MARCH 3, 2019
If, however, there wasn’t a new file on the server, we’ll bring back a 304 header, no new file, but an entire roundtrip of latency. We can completely cut out the overhead of a roundtrip of latency. This means no unnecessary roundtrips spent retrieving 304 responses, which potentially saves us a lot of latency on the critical path ( CSS blocks rendering ). On high latency connections, this saving could be tangible.
The Morning Paper
OCTOBER 6, 2019
Prediction serving latency matters. Lesson 4: prediction serving latency matters. In a experiment introducing synthetic latency, Booking.com found that an increase of about 30% in latency cost about 0.5%
The Morning Paper
SEPTEMBER 10, 2019
That’s hard for many reasons, including the differing trade-offs between throughput and latency that need to be made across the use cases. Oh, and in additional to low latency, “ we require access to fresh data.”
Uber Engineering
MAY 14, 2019
To deliver the real-time performance expected from Uber’s users, our mobile apps require low-latency and highly … The post Employing QUIC Protocol to Optimize Uber’s App Performance appeared first on Uber Engineering Blog. Uber operates on a global scale across more than 600 cities, with our apps relying entirely on wireless connectivity from over 4,500 mobile carriers.
The Morning Paper
MAY 12, 2019
The paper examines the implications of microservices at the hardware, OS and networking stack, cluster management, and application framework levels, as well as the impact of tail latency. The bottom line shows the tail latency impact in the microservices-based applications.
Dynatrace
AUGUST 27, 2019
Step 5 – xMatters triggers a runbook in Ansible to fix the disk latency. As a last step, xMatters triggers a runbook in Ansible to push the disk latency fix. Dynatrace news.
The Morning Paper
JUNE 13, 2019
Making queries to an inference engine has many of the same throughput, latency, and cost considerations as making queries to a datastore, and more and more applications are coming to depend on such queries. A case for managed and model-less inference serving Yadwadkar et al., HotOS’19.
DZone
JUNE 20, 2019
From 11:48 to 12:10 latency for at least 50% of requests was significantly higher from us-east1 and us-central1 to GCS regional buckets in us-east1, us-central1, and europe-west2. From 11:48 to 12:03 latency was also elevated for europe-west2 to europe-west2 regional bucket access.
The Netflix TechBlog
AUGUST 22, 2019
The canary stage will determine a score based on metrics such as CPU, threads, latency, and GC pauses. Baking Windows with Packer By Justin Phelps and Manuel Correa Customizing Windows images at Netflix was a manual, error-prone, and time consuming process.
The Morning Paper
JULY 4, 2019
Two failure modes we focus on are a service becoming slower (increase in response latency) or a service failing outright (returning errors). If you’ve read the SRE book you’ve probably come across the “four golden signals” (p60): latency, throughput, error rate, and saturation.
VoltDB
NOVEMBER 10, 2017
The performance consists of two aspects: throughput and latency. Humans will wait much longer than an API will since APIs have strict latency expectations due to timeouts. But in most cases in modern applications, the application expectation is far less than the baked-in latency.
DZone
JULY 10, 2019
In addition, compute and storage are increasingly being separated causing larger latencies for queries. The Apache Spark + Alluxio stack is getting quite popular particularly for the unification of data access across S3 and HDFS. Alluxio is leveraged as compute-side virtual storage to improve performance. But to get the best performance, like any technology stack, you need to follow the best practices.
High Scalability
MARCH 1, 2019
It was made possible by using a low latency of 0.1 seconds, the lower the latency, the more responsive the robot. Wake up! It's HighScalability time: 10 years of AWS architecture increasing simplicity or increasing complexity? Michael Wittig ). Do you like this sort of Stuff?
HammerDB
OCTOBER 18, 2019
cpupower frequency-info analyzing CPU 0: driver: intel_pstate CPUs which run at the same hardware frequency: 0 CPUs which need to have their frequency coordinated by software: 0 maximum transition latency: Cannot determine or is not supported.
CSS Wizardry
OCTOBER 27, 2018
Things always always feel fast when we’re developing because, more often than not, we’re working on high-spec machines on dedicated networks, and also serving from localhost which removes the bulk of the latency and bandwidth issues that a real user would suffer.
The Morning Paper
JUNE 23, 2019
In ProtoCache (a component of a widely used Google application), 27% of its latency when using a traditional S+RInK design came from marshalling/un-marshalling. (We’ve The network latency of fetching data over the network, even considering fast data center networks.
All Things Distributed
APRIL 24, 2019
AWS customers can now use this Region to serve their end users in Hong Kong SAR at a lower latency, and to comply with any data locality requirements. Today, I am happy to introduce the new AWS Asia Pacific ( Hong Kong ) Region.
The Netflix TechBlog
JULY 12, 2019
This data-propagation latency was unacceptable?—?we The Tangible Result With the data propagation latency issue solved, we were able to re-implement the Gatekeeper system to eliminate all I/O boundaries.
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