https://github.com/williamweixiao closed
https://github.com/llvm/llvm-project/pull/88438
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https://github.com/williamweixiao approved this pull request.
https://github.com/llvm/llvm-project/pull/88438
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@@ -2547,22 +2547,40 @@ usual build cycle when using sample profilers for
optimization:
used in the first step. The only requirement is that you build the code
with the same debug info options and ``-fprofile-sample-use``.
+ On Linux:
+
.. code-block:: console
https://github.com/tcreech-intel updated
https://github.com/llvm/llvm-project/pull/88438
>From fe3404cbdf78b434f16f8351dc242175b4543112 Mon Sep 17 00:00:00 2001
From: Tim Creech
Date: Thu, 11 Apr 2024 16:03:52 -0400
Subject: [PATCH 1/4] Improve documented sampling profiler steps to best known
@@ -2547,22 +2547,40 @@ usual build cycle when using sample profilers for
optimization:
used in the first step. The only requirement is that you build the code
with the same debug info options and ``-fprofile-sample-use``.
+ On Linux:
+
.. code-block:: console
https://github.com/tcreech-intel updated
https://github.com/llvm/llvm-project/pull/88438
>From fe3404cbdf78b434f16f8351dc242175b4543112 Mon Sep 17 00:00:00 2001
From: Tim Creech
Date: Thu, 11 Apr 2024 16:03:52 -0400
Subject: [PATCH 1/3] Improve documented sampling profiler steps to best known
https://github.com/chrulski-intel approved this pull request.
https://github.com/llvm/llvm-project/pull/88438
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https://github.com/tcreech-intel updated
https://github.com/llvm/llvm-project/pull/88438
>From fe3404cbdf78b434f16f8351dc242175b4543112 Mon Sep 17 00:00:00 2001
From: Tim Creech
Date: Thu, 11 Apr 2024 16:03:52 -0400
Subject: [PATCH 1/2] Improve documented sampling profiler steps to best known
@@ -2443,27 +2443,29 @@ usual build cycle when using sample profilers for
optimization:
usual build flags that you always build your application with. The only
requirement is that DWARF debug info including source line information is
generated. This DWARF information
@@ -2443,27 +2443,29 @@ usual build cycle when using sample profilers for
optimization:
usual build flags that you always build your application with. The only
requirement is that DWARF debug info including source line information is
generated. This DWARF information
tcreech-intel wrote:
@williamweixiao, @HaohaiWen, this updates the docs to describe best practices
given #83972.
It seems `-fdebug-info-for-profiling` can be particularly important. Without it
we were discarding nearly half of the samples in some cases.
llvmbot wrote:
@llvm/pr-subscribers-clang
Author: Tim Creech (tcreech-intel)
Changes
1. Add `-fdebug-info-for-profiling -funique-internal-linkage-names`, which
improve the usefulness of debug info for profiling.
2. Recommend the use of `br_inst_retired.near_taken:uppp`, which provides
https://github.com/tcreech-intel ready_for_review
https://github.com/llvm/llvm-project/pull/88438
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https://github.com/tcreech-intel created
https://github.com/llvm/llvm-project/pull/88438
1. Add `-fdebug-info-for-profiling -funique-internal-linkage-names`, which
improve the usefulness of debug info for profiling.
2. Recommend the use of `br_inst_retired.near_taken:uppp`, which provides the
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