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Home→Author mev - Page 3 << 1 2 3 4 5 6 7 >>

Author Archives: mev

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topdown tool – adding support for level 3 frontend

Performance analysis, tools and experiments Posted on 2018-05-24 by mev2018-05-24

The Intel topdown performance analysis method separates out frontend stalls (level 1) into latency (level 2) and bandwidth (level 2). A frontend latency stall is when 0 uops are issued at all because the frontend is waiting. A frontend bandwidth … Continue reading →

Posted in tools | Tagged metrics, top-down | Leave a reply

Phoronix article – compilers on threadripper (2018-05-23)

Performance analysis, tools and experiments Posted on 2018-05-23 by mev2018-05-26

Phoronix posted an article comparing compilers on threadripper. The comparison uses gcc7/gcc8/llvm5/llvm6/llvm7 and AMD AOCC. All benchmarks were compiled with -O3 -march=native.

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Posted in analysis | Tagged phoronix benchmark article | Leave a reply

Phoronix article – Spectre V4 performance (2018-05-22)

Performance analysis, tools and experiments Posted on 2018-05-23 by mev2018-05-26

Phoronix posted an article measuring Spectre V4 changes. These tests happen with kernel patches for the Spectre 3a (rogue system register read) and Spectre 4 (speculative store bypass) fixes are applied to the kernel. There is an AMD whitepaper describing … Continue reading →

Posted in analysis | Tagged phoronix benchmark article, spectre | Leave a reply

Phoronix article – Dragonfly BSD (2018-05-21)

Performance analysis, tools and experiments Posted on 2018-05-21 by mev2018-05-26

Phoronix posted an article comparing performance for newest release of Dragonfly BSD. The comparison made is between the old release (5.2) and the new release under development (5.3). Overall, performance looks improved from new to older release. Unclear how this … Continue reading →

Posted in analysis | Tagged phoronix benchmark article | Leave a reply

topdown tool

Performance analysis, tools and experiments Posted on 2018-05-21 by mev2018-05-21

I have added a basic tool “topdown” that is a wrapper to collect topdown metrics.

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Posted in tools | Tagged metrics, top-down | Leave a reply

Phoronix article – AMD A0CC 1.2 (2018-05-20)

Performance analysis, tools and experiments Posted on 2018-05-20 by mev2018-05-26

Phoronix posted an article benchmarking the newest AMD AOCC compiler. The article compares performance with gcc 7, gcc 8 and llvm 6. This article goes through some of the benchmarks to understand what is measured. Overall, not sure the benchmarks … Continue reading →

Posted in analysis | Tagged phoronix benchmark article | Leave a reply

Phoronix article – windows subsystem for linux benchmarks (2018-05-18)

Performance analysis, tools and experiments Posted on 2018-05-18 by mev2018-05-26

Phoronix posted an article benchmarking the window subsystem for linux. The comparisons are between Ubuntu 18.04 running in WSL vs. Ubuntu 18.04 running directly on the processor and the older WSL using Ubuntu 16.04.

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Posted in analysis | Tagged phoronix benchmark article | Leave a reply

Phoronix article – Ryzen 2600/2700 benchmarks (2018-05-16)

Performance analysis, tools and experiments Posted on 2018-05-17 by mev2018-06-14

Phoronix posted an an article measuring Ryzen 2600 and Ryzen 2700. The comparisons were a 9-way CPU comparison of new processors (7 AMD and 2 Intel). In this posting, I’ll look more at the workloads being tested.

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Posted in analysis | Tagged phoronix benchmark article | Leave a reply

Performance counters and memory analysis; checking with pmu_tools

Performance analysis, tools and experiments Posted on 2018-05-17 by mev2018-05-21

After my previous post on backend analysis, I got a chance to look further breaking out backend stall statistics.

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Posted in analysis | Tagged memory, metrics, performance counters, pmu_tools | Leave a reply

Phoronix article – clear linux benchmarks (2018-05-16)

Performance analysis, tools and experiments Posted on 2018-05-15 by mev2018-05-23

Phoronix posted an article about Clear linux. The goal was to look for changes in the system after all packages were rebuilt with GCC 8.1.

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Posted in analysis | Tagged phoronix benchmark article | Leave a reply

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