Please don't reply to lustre-devel. Instead, comment in Bugzilla by using the following link: https://bugzilla.lustre.org/show_bug.cgi?id=11289
I'm going to post several files... mybench.c is the benchmark I'm using. I run it with -w on nodeA then run it with -r on nodeB. I will also post before and after readahead stats. Here is the output from the run for a 104MB file... [EMAIL PROTECTED]:~/benchmarks/sio> ./mybench /lustre/scratch/canon/test/testfile -r Ct time(ms) Bytes Rate(MB/s) 0 116 8388608 69 1 725 8388608 11 2 1529 8388608 5 3 2369 8388608 3 4 3231 8388608 2 5 21 8388608 381 6 16 8388608 500 7 17 8388608 471 8 11 8388608 727 9 11 8388608 727 10 9 8388608 889 11 26 8388608 308 12 33 8388608 242 13 1 0 0 Total: 104 MB 13 MB/s As you can see in cts 2-4, things get very slow. After that it picks up and runs pretty well. The only noticeable thing in the stats is that the failed grab_cache_page seems to be incrementing quite a bit. _______________________________________________ Lustre-devel mailing list [email protected] https://mail.clusterfs.com/mailman/listinfo/lustre-devel
