----- Original Message ----- > > > 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? Well, I'm not particularly thrilled about the requirement of three additional packages and the extra library. In the most recent crash release I did add the capability of easily adding extra libraries to the build procedure. But if the feature ever becomes the default in a future RHEL distribution, then I guess I won't have any choice but to force the requirement of the packages and library. 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 > > > > -- > Crash-utility mailing list > Crash-utility at redhat.com > https://www.redhat.com/mailman/listinfo/crash-utility >
