Brendan Gregg

OCTOBER 7, 2018

more capable, and built from the ground up for the modern era of the eBPF virtual machine. eBPF was created by Alexei Starovoitov while at PLUMgrid (he's now at Facebook) as a generic in-kernel virtual machine, with software defined networks as the primary use case. It's shaping up to be a DTrace version 2.0: Attaching 2 probes. ^C

C++ 40

C++ Virtualization Programming Latency 40

n0derunner

MARCH 7, 2019

pgbench -c 10 -S -T 600 -P 1 p gbench. Then reboot the kernel I used these excellent resources How to modify the kernel command line How to enable hugepages and this great video on Linux virtual memory. The workstation has 32GB of memory Postgres is given 16GB of memory using the parameter. shared_buffers = 16384MB. pgbench -i -s 500.

Performance 40

Performance Benchmarking C++ Virtualization 40

Brendan Gregg

SEPTEMBER 25, 2021

CLI tools The Cassandra systems were EC2 virtual machine (Xen) instances. Note that Ubuntu also has a frame to show entry into vDSO (virtual dynamic shared object). As (C) looked like a kernel rebuild, I started with (D) and (E). ## 5. I also rewrote this in C and called gettimeofday(2) directly: $ cat gettimeofdaybench.c.

Speed 126

Speed Java AWS Virtualization 126

HammerDB

FEBRUARY 25, 2021

To benchmark a database we introduce the concept of a Virtual User. For HammerDB both TPROC-C and TPROC-H run all of their workloads on the database being tested in SQL. The following is an example from TPROC-C from SQL Server. TPROC-C however is derived from the TPC-C specification and requires application logic around the SQL.

Programming 67

Programming Benchmarking Virtualization C++ 67

The Netflix TechBlog

AUGUST 29, 2023

The abstractions that Eureka provides for this are Virtual IPs (VIPs) for insecure communication, and Secure VIPs (SVIPs) for secure. If service A needs to talk to clusters B and C, then you need to define clusters B and C as part of A’s proxy config. It’s been a great experience working with you all on this.

Traffic 220

Traffic Latency Cloud C++ 220

Brendan Gregg

SEPTEMBER 25, 2021

CLI tools The Cassandra systems were EC2 virtual machine (Xen) instances. Note that Ubuntu also has a frame to show entry into vDSO (virtual dynamic shared object). As (C) looked like a kernel rebuild, I started with (D) and (E). ## 6. I also rewrote this in C and called gettimeofday(2) directly: $ cat gettimeofdaybench.c

Speed 40

Speed Java AWS Virtualization 40

HammerDB

OCTOBER 12, 2018

This post complements the previous best practice guides this time with the focus on MySQL and MariaDB and achieving top levels of performance with the HammerDB MySQL TPC-C test. SELECT DISTINCT c from sbtest where id between ? order by c. SELECT c from sbtest where id=? Copyright (C) 2003-2018 Steve Shaw.

Best Practices 40

Best Practices Scalability Performance C++ 40

HammerDB

NOVEMBER 5, 2018

If you are new to running Oracle, SQL Server, MySQL and PostgreSQL TPC-C workloads with HammerDB and have needed to investigate I/O performance the chances are that you have experienced waits on writing to the Redo, Transaction Log or WAL depending on the database you are testing. A good example of how tuning is an iterative process.

Benchmarking 40

Benchmarking Database C++ Virtualization 40

HammerDB

OCTOBER 18, 2019

bin/pgbench -c 1 -S -T 60 pgbench starting vacuum.end. It is also worth noting that C-states are an important part of balancing power and performance and in this case we leave them enabled./cpupower bin/pgbench -c 1 -S -T 60 pgbench starting vacuum.end. So after installing PostgreSQL 12.0 bin/createdb pgbench./bin/pgbench

Benchmarking 63

Benchmarking Performance Hardware C++ 63

Brendan Gregg

FEBRUARY 9, 2018

In this post I'll look at the Linux kernel page table isolation (KPTI) patches that workaround Meltdown: what overheads to expect, and ways to tune them. virtual (bgregg-c5.9xl-i-xxx) 02/09/2018 _x86_64_ (36 CPU) 05:24:51 PM proc/s cswch/s. Hit Ctrl-C to end. Much of my testing was on Linux 4.14.11 and 4.14.12 Linux 4.14.12-virtual

Performance 75

Performance Benchmarking Cache Tuning 75

Brendan Gregg

SEPTEMBER 5, 2017

Hit Ctrl-C to end. ^C C operation = 'read' usecs : count distribution 0 -> 1 : 0 | | 2 -> 3 : 0 | | 4 -> 7 : 4479 | *| 8 -> 15 : 1028 | | 16 -> 31 : 14 | | 32 -> 63 : 1 | | [.]. What happens if processes really do try to populate all that virtual memory? Tracing ZFS operation latency.

Virtualization 76

Virtualization AWS Engineering Hardware 76

HammerDB

JANUARY 5, 2019

“ Scalability” is a product of both the benchmarking application itself (See the post on HammerDB Architecture to see how it scales implementing multiple virtual users as threads) as well as the benchmarking workload (The TPC benchmarks that HammerDB uses have been designed specifically for this purpose and proven over decades to scale).

Benchmarking 40

Benchmarking Database Social Media Scalability 40

Brendan Gregg

FEBRUARY 8, 2018

In this post I'll look at the Linux kernel page table isolation (KPTI) patches that workaround Meltdown: what overheads to expect, and ways to tune them. virtual (bgregg-c5.9xl-i-xxx) 02/09/2018 _x86_64_ (36 CPU) 05:24:51 PM proc/s cswch/s. Hit Ctrl-C to end. Much of my testing was on Linux 4.14.11 and 4.14.12 Linux 4.14.12-virtual

Performance 40

Performance Benchmarking Cache Tuning 40

SQL Server According to Bob

JANUARY 11, 2020

Character POS ASCII Value Formula Value A 1 65 67 C 2 67 69 Checksum 136 Comparing ​​ the checksum values indicates ​​ that the values do not match and ​​ damage ​​ has occurred to the data. ​​ The following table outlines the virtual protection states.

Servers 40

Servers Cache Database Media 40

Smashing Magazine

NOVEMBER 24, 2021

If you’re working from home and are missing the familiar office sounds, [I Miss The Office]([link] brings some **office atmosphere** into your home office — with virtual colleagues who produce typical sounds like typing, squeaking chairs, or the occasional bubbling of the watercooler. Image credit: I Miss The Office ).

Website 122

Website Design Games Open Source 122