search for: 7m11

...0 > > Note this is making 10,000 pread requests. > > real 1m26.755s > user 0m0.230s > sys 0m0.539s > > (3) VDDK plugin same as in (2). > > NR_MULTI_CONN = 8 > NR_CYCLES = 10000 > > Note this is making 80,000 pread requests in total. > > real 7m11.729s > user 0m2.891s > sys 0m6.037s > > My observations: > > Tests (1) and (2) are about the same within noise. > > Test (3) is making 8 times as many requests as test (1), so I think > it's fair to compare the 8 x time taken by test (1) (ie. the time it > w...

Nir, BTW what are you using for performance testing? As far as I can tell it's not possible to make qemu-img convert use multi-conn when connecting to the source (which is going to be a problem if we want to use this stuff in virt-v2v). Instead I've hacked up a copy of this program from libnbd: https://github.com/libguestfs/libnbd/blob/master/examples/threaded-reads-and-writes.c so

...plugin patched to support SERIALIZE_REQUESTS. NR_MULTI_CONN = 1 NR_CYCLES = 10000 Note this is making 10,000 pread requests. real 1m26.755s user 0m0.230s sys 0m0.539s (3) VDDK plugin same as in (2). NR_MULTI_CONN = 8 NR_CYCLES = 10000 Note this is making 80,000 pread requests in total. real 7m11.729s user 0m2.891s sys 0m6.037s My observations: Tests (1) and (2) are about the same within noise. Test (3) is making 8 times as many requests as test (1), so I think it's fair to compare the 8 x time taken by test (1) (ie. the time it would have taking to make 80,000 requests): Test (1)...