Brendan Gregg

OCTOBER 8, 2018

Screenshot: tracing read latency for PID 181: # bpftrace -e 'kprobe:vfs_read /pid == 30153/ { @start[tid] = nsecs; } kretprobe:vfs_read /@start[tid]/ { @ns = hist(nsecs - @start[tid]); delete(@start[tid]); }'. Here's key differences as of August 2018: Type DTrace bpftrace. ply is also C, whereas bpftrace is C++. #

C++ 110

C++ Virtualization Programming Latency 110

Brendan Gregg

AUGUST 29, 2021

1072-aws (xxx) 12/18/2018 _x86_64_ (16 CPU) avg-cpu: %user %nice %system %iowait %steal %idle 5.03 1072-aws (xxx) 12/18/2018 _x86_64_ (16 CPU) avg-cpu: %user %nice %system %iowait %steal %idle 5.03 biolatency From [bcc], this eBPF tool shows a latency histogram of disk I/O. Hit Ctrl-C to end. ^C Hit Ctrl-C to end. ^C

Cache 105

Cache C++ AWS Latency 105

Brendan Gregg

OCTOBER 7, 2018

Screenshot: tracing read latency for PID 181: # bpftrace -e 'kprobe:vfs_read /pid == 30153/ { @start[tid] = nsecs; } kretprobe:vfs_read /@start[tid]/ { @ns = hist(nsecs - @start[tid]); delete(@start[tid]); }'. Here's key differences as of August 2018: Type DTrace bpftrace. ply is also C, whereas bpftrace is C++. #

C++ 40

C++ Virtualization Programming Latency 40

ACM Sigarch

MARCH 25, 2019

With two blog posts, we argue for more use of simple models beyond Amdahl’s Law. Previously, Part 1 of these two blog posts provided our thesis that analytic models can complement measurement and simulations to give quick insight, show what is not possible, provide a double-check, and suggest future directions. and 1/S as ?.

Systems 53

Systems Latency Performance C++ 53

ACM Sigarch

MARCH 18, 2019

With two blog posts, we argue for more use of simple models beyond Amdahl’s Law. To this end, we present three simple models that we find useful like Amdahl’s Law, split here into two blog posts. How many buffers are needed to track pending requests as a function of needed bandwidth and expected latency? Answered in Part 2.).

Systems 60

Systems Latency Performance Analytics 60

Brendan Gregg

AUGUST 29, 2021

1072-aws (xxx) 12/18/2018 _x86_64_ (16 CPU) avg-cpu: %user %nice %system %iowait %steal %idle 5.03 100.00 ^C I'm looking at the r_await column in particular: the average wait time for reads in milliseconds. . ## 2. 1072-aws (xxx) 12/18/2018 _x86_64_ (16 CPU) avg-cpu: %user %nice %system %iowait %steal %idle 5.03

Cache 40

Cache C++ AWS Systems 40

The Netflix TechBlog

MARCH 13, 2020

As mentioned in our earlier blog post , Intel and Netflix have been collaborating on the SVT-AV1 encoder and decoder framework since August 2018. In this tech blog, we will report the current status of the SVT-AV1 project, as well as the characteristics and performance of the encoder and decoder.

Open Source 154

Open Source Efficiency C++ Speed 154