❔ Parallel.ForEach is actually slow

I have a process which I need to run very fast. when running with parallel.foreach (8) (my cpu is 16) it takes 2 minutes.
When splitting the data and running it from two seperate EXE processes, it takes 1 minute for both (half time, same data).
Anyone knows why? or how can I fix it without running multiple processes? thanks

Note: changing degree to 16 makes it even slower.

            Parallel.ForEach(sfs, new ParallelOptions { MaxDegreeOfParallelism = 8 }, sf =>
            {
        var success= PerformFromDatabase(sfString);
}

            Parallel.ForEach(sfs, new ParallelOptions { MaxDegreeOfParallelism = 8 }, sf =>
            {
        var success= PerformFromDatabase(sfString);
}

C#•3y ago•

82 replies

Super

❔ Parallel.ForEach is actually slow

Note: changing degree to 16 makes it even slower.

            Parallel.ForEach(sfs, new ParallelOptions { MaxDegreeOfParallelism = 8 }, sf =>
            {
        var success= PerformFromDatabase(sfString);
}

            Parallel.ForEach(sfs, new ParallelOptions { MaxDegreeOfParallelism = 8 }, sf =>
            {
        var success= PerformFromDatabase(sfString);
}

❔ Parallel.ForEach is actually slow

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