https://community.intel.com/t5/Intel-Integrated-Performance/ThreadPool-and-IPP-decryption/m-p/990908#M22298 Looks like you are calling openmp in your implementation. You may be getting hung up trying to create native openmp threads in a managed environment. Can you provide a simple example of how you are making your calls in C#? Tue, 11 Sep 2012 20:20:47 GMT Chuck_De_Sylva 2012-09-11T20:20:47Z https://community.intel.com/t5/Intel-Integrated-Performance/ThreadPool-and-IPP-decryption/m-p/990907#M22297 <P>Hello,</P> <P>I have the following issue -</P> <P>When decrypting files, IPPs is spawning multiple worker threads and never clearing/releasing these threads. I end up with hundreds or thousands of threads. Details below:</P> <P>Written in C#, I am hosting a remoting service. This remoting service simply accepts a filename and decrypts the file using Ipps (release 5.3, 6.1, doesn't matter..). I have a client application that is calling this remoting service with multiple simultaneous requests. Ipps is set to use 8 threads. When the service gets busier, the number of threads increases.. and increases.. Eventually, it'll get into 1000+. I believe this is happening because .Net uses a thread pool to handle the remoting requests. Since the threads are basically reused, the Ipps worker threads never get released. Even if I close the client application, the threads do not get released.</P> <P>In process explorer, I have thousands of threads like 'libguid40.dll!_kmp_launch_worker', or 'libiomp5md_....' if I'm using 6.1.6.</P> <P>If I run the exact same code as in the example above in a single standalone application, there is no issue - the Ipps worker threads get released as soon as my thread finishes. It appears that it's the thread pool/remoting that is causing the threads to never get released.</P> <P>I know that I can set the number of threads to one. That helps - the threads still grow, but theyr'e growing one at a time instead of 7 or 8 at a time. And, the performance isn't as good.</P> <P>Can anyone tell me more precisely why this is happening and what a workaround might be?</P> <P>Many Thanks!</P> Tue, 11 Sep 2012 00:02:51 GMT https://community.intel.com/t5/Intel-Integrated-Performance/ThreadPool-and-IPP-decryption/m-p/990907#M22297 CP_H_ 2012-09-11T00:02:51Z https://community.intel.com/t5/Intel-Integrated-Performance/ThreadPool-and-IPP-decryption/m-p/990908#M22298 Looks like you are calling openmp in your implementation. You may be getting hung up trying to create native openmp threads in a managed environment. Can you provide a simple example of how you are making your calls in C#? Tue, 11 Sep 2012 20:20:47 GMT https://community.intel.com/t5/Intel-Integrated-Performance/ThreadPool-and-IPP-decryption/m-p/990908#M22298 Chuck_De_Sylva 2012-09-11T20:20:47Z