Hi all: I'm also experimenting with LD_PRELOADing the user space shared library to bypass the kernel module. I have a cluster in which usage of pvfs on this cluster is conditional on NOT requiring any kernel modules or kernel modifications. Besides, from what I understand, I should see higher performance.
So far, my tests have been "interesting". I'm not sure I've got the correct library either, though. The docs at http://www.omnibond.com/orangefs/docs/v_2_8_6/index.htm have been helpful, but not quite addressed all my questions. So, with LD_PRELOAD set to /opt/pvfs2/lib/libofs.so, I can run ls and cp, and it appears to work, even on one system without the kernel module loaded. However, other commands accessing non-pvfs structures appear to fail. For example, I can't pull up cp's man page. On the only test where I cp'ed a file to my local disk, the IO rate was in line with what I would expect for my local disk's max throughput, but in the end, the resulting file was 0 byes (original was 10GB). Am I doing something wrong? These tests were performed with OrangeFS 2.8.6 client, 2.8.5 server. Thanks! --Jim
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