Seems counter-logical, but we have testimony that you may need to reduce the prefetchThreads parameter. Of all the parameters, that's the one that directly affects prefetching, so worth trying. Jan-Frode Myklebust wrote: ...Digging further I found that reducing prefetchThreads from default=72 to 32 also fixed it, while leaving maxMBpS at 10000. Can now also read at 3,2 GByte/s.... I can speculate that having prefetchThreads to high may create a contention situation where more threads causes overall degradation in system performance. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://gpfsug.org/pipermail/gpfsug-discuss_gpfsug.org/attachments/20170421/8dd9ff3d/attachment.html> -------------- next part -------------- A non-text attachment was scrubbed... Name: not available Type: image/gif Size: 21994 bytes Desc: not available URL: <http://gpfsug.org/pipermail/gpfsug-discuss_gpfsug.org/attachments/20170421/8dd9ff3d/attachment.gif>
