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I have an windows application that is having performance and stability issues that our company has bought from a vendor.

I noticed the application was using 1,000 - 4,000 threads. Could this be causing the stability and performance problems? The cpu is not too high (50% of 16 cpus) and disk I/O is 7-20 Mb/sec which doesn't seem high either.

I would think the computer would be spending all it's time doing context switches with so many threads!

Any thoughts?

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  • How exactly did you determine its opening that many threads, which doesn't tell you very much, if the CPU usage is only at 50%. In other words doubtful I have seen applications have more threads by 3x to 4x that.
    – Ramhound
    Oct 23, 2015 at 22:17
  • I saw in the windows performance monitor, it was opening 4-6 every second.
    – anthonybell
    Oct 23, 2015 at 23:49
  • The number of threads was increasing by 4-6 per second? Continuously? Also: Do you really have 16 CPU cores, or is this with hyperthreading enabled?
    – Jamie Hanrahan
    Oct 24, 2015 at 18:26
  • It was using 4-6 more threads with each second. I believe that is without hyperthreading, since I believe windows performance monitor shows 1 graph per cpu..
    – anthonybell
    Oct 26, 2015 at 0:26
  • Actually I have 2 cores/4 logical cores. It looks like windows performance monitor does show logical cores.
    – anthonybell
    Oct 27, 2015 at 12:16

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