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Properly rebuild optimization data when it changes #56397

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Jul 28, 2021
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Properly rebuild optimization data when it changes #56397

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Properly rebuild optimization data when it changes
jakobbotsch Jul 27, 2021
51b574f
Use Enumerable.Max
jakobbotsch Jul 27, 2021
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1 change: 1 addition & 0 deletions src/coreclr/crossgen-corelib.proj
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Original file line number Diff line number Diff line change
Expand Up @@ -66,6 +66,7 @@
<DotNetPgoCmd>$(DotNetCli) $([MSBuild]::NormalizePath('$(BinDir)', 'dotnet-pgo', 'dotnet-pgo.dll')) merge</DotNetPgoCmd>
<DotNetPgoCmd>$(DotNetPgoCmd) -o:$(MergedMibcPath)</DotNetPgoCmd>
<DotNetPgoCmd>$(DotNetPgoCmd) @(OptimizationMibcFiles->'-i:%(Identity)', ' ')</DotNetPgoCmd>
<DotNetPgoCmd>$(DotNetPgoCmd) --inherit-timestamp</DotNetPgoCmd> <!-- For incremental builds, otherwise timestamp is too far in the future -->
</PropertyGroup>

<Message Condition="'$(DotNetBuildFromSource)' != 'true'" Importance="High" Text="$(DotNetPgoCmd)"/>
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3 changes: 3 additions & 0 deletions src/coreclr/tools/dotnet-pgo/CommandLineOptions.cs
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Expand Up @@ -45,6 +45,7 @@ internal class CommandLineOptions
public bool DumpMibc = false;
public FileInfo InputFileToDump;
public List<FileInfo> CompareMibc;
public bool InheritTimestamp;

public string[] HelpArgs = Array.Empty<string>();

Expand Down Expand Up @@ -265,6 +266,8 @@ void HelpOption()
}
}

syntax.DefineOption(name: "inherit-timestamp", value: ref InheritTimestamp, help: "If specified, set the output's timestamp to the max timestamp of the input files");
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VerbosityOption();
CompressedOption();
HelpOption();
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12 changes: 11 additions & 1 deletion src/coreclr/tools/dotnet-pgo/Program.cs
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Expand Up @@ -378,7 +378,17 @@ static int InnerMergeMain(CommandLineOptions commandLineOptions)
ProfileData.MergeProfileData(ref partialNgen, mergedProfileData, MIbcProfileParser.ParseMIbcFile(tsc, peReader, assemblyNamesInBubble, onlyDefinedInAssembly: null));
}

return MibcEmitter.GenerateMibcFile(tsc, commandLineOptions.OutputFileName, mergedProfileData.Values, commandLineOptions.ValidateOutputFile, commandLineOptions.Uncompressed);
int result = MibcEmitter.GenerateMibcFile(tsc, commandLineOptions.OutputFileName, mergedProfileData.Values, commandLineOptions.ValidateOutputFile, commandLineOptions.Uncompressed);
if (result == 0 && commandLineOptions.InheritTimestamp)
{
static DateTime Latest(IEnumerable<DateTime> datetimes)
=> datetimes.Aggregate((cur, dt) => dt > cur ? dt : cur);

commandLineOptions.OutputFileName.CreationTimeUtc = Latest(commandLineOptions.InputFilesToMerge.Select(fi => fi.CreationTimeUtc));
commandLineOptions.OutputFileName.LastWriteTimeUtc = Latest(commandLineOptions.InputFilesToMerge.Select(fi => fi.LastWriteTimeUtc));
}
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@EgorBo EgorBo Jul 27, 2021 •
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You could do it in one chain 🙂:

commandLineOptions.InputFilesToMerge
    .Select(fi => fi.CreationTimeUtc)
    .Combine(commandLineOptions.InputFilesToMerge.Select(fi => fi.LastWriteTimeUtc))
    .OrderByDescending(d => d).FirstOrDefault();

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I'm setting CreationTimeUtc and LastWriteTimeUtc separately here, so I would need two chains (or set both to the same, I guess that would work too). Actually, I see now that I can just use .Max() so will change it to that.


return result;
}
finally
{
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