Re: [Crash-utility] [RFC] makedumpfile, crash: LZO compression support

> > Hello Hatayama-san, > > > > Thank you for your work. > > > >> Performance Comparison: > >> > >> Sample Data > >> > >> Ideally, I must have measured the performance for many enough > >> vmcores generated from machines that was actually running, but now > >> I don't have enough sample vmcores, I couldn't do so. So this > >> comparison doesn't answer question on I/O time improvement. This > >> is TODO for now. > > > > I'll measure the performance for actual vmcores by makedumpfile. > > Please wait for a while. I measured the performance of makedumpfile for some vmcores. Please see below. Sample Data To simulate a working server, I captured VMCOREs while almost all pages were alloceted and filled with random data. (See attached file "fill_random.c") I captured the VMCOREs of 5GB, 7.5GB and 10GB in the same condition. How to measure I measured the total execution time and the size of output file. $ time makedumpfile --message-level 16 [-c|-l| ] vmcore dumpfile Result See attached file "result.txt". This time, lzo's compression was the quickest, and lzo's compression ratio is almost the same(only a bit worse) as zlib's. It seems good, and I will merge the patch set into the makedumpfile. What is your opinion, Dave? Thanks. KUMAGAI, Atsushi > > That's very helpful. Thanks in advance. > > But of course I'm also still looking for alternative way. > > Thanks. > HATAYAMA, Daisuke >