Hi, I have the results from the tests (below). Alot of the time is spent in checking file permissions and locking the file (40 %).
Inmem % time seconds usecs/call calls errors syscall ------ ----------- ----------- --------- --------- ---------------- 28.53 0.124727 1 118524 write 23.42 0.102382 0 414624 gettimeofday 20.78 0.090840 1 76513 read 13.72 0.059977 0 191255 _llseek Db in tmpfs % time seconds usecs/call calls errors syscall ------ ----------- ----------- --------- --------- ---------------- 21.83 0.257073 1 263306 write 21.18 0.249488 1 179148 179148 access 20.61 0.242725 0 509292 fcntl64 13.04 0.153551 0 448720 _llseek 9.44 0.111194 1 189370 read 8.16 0.096124 0 414624 gettimeofday 2.55 0.030000 3750 8 fdatasync On Tue, Aug 9, 2011 at 7:34 PM, Pavel Ivanov <paiva...@gmail.com> wrote: > > Journal mode is WAL > > I believe in-memory database can't have journal mode WAL. So you > compare completely different settings. > > > Pavel > > > On Tue, Aug 9, 2011 at 5:15 AM, <sreekumar...@gmail.com> wrote: > > > > Journal mode is WAL > > > > > > ------Original Message------ > > From: Roger Binns > > Sender: sqlite-users-boun...@sqlite.org > > To: General Discussion of SQLite Database > > ReplyTo: General Discussion of SQLite Database > > Subject: Re: [sqlite] In memory v/s tmpfs > > Sent: Aug 9, 2011 2:42 PM > > > > -----BEGIN PGP SIGNED MESSAGE----- > > Hash: SHA1 > > > > On 08/08/2011 06:34 PM, sreekumar...@gmail.com wrote: > >> From the point of view of performance, I expected similar performance , > tmpfs being a little slower due to filesystem overhead. However, the > operations on tmpfs was much slower than expected. > > > > Using tmpfs requires many kernel calls which is considerably more effort > > than the occasional malloc call. Additionally files have to be locked, > > journals made etc (you didn't mention your journal setting). > > > > Roger > > -----BEGIN PGP SIGNATURE----- > > Version: GnuPG v1.4.11 (GNU/Linux) > > Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ > > > > iEYEARECAAYFAk5A+g0ACgkQmOOfHg372QTR8ACgqNeeuOxHRy7+hMH5RY/OAyV2 > > Wq0AoMaSRtoFN4obCgmgHlpHthd9z5Zp > > =pkJt > > -----END PGP SIGNATURE----- > > _______________________________________________ > > sqlite-users mailing list > > sqlite-users@sqlite.org > > http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users > > > > > > Sent from BlackBerry® on Airtel > > _______________________________________________ > > sqlite-users mailing list > > sqlite-users@sqlite.org > > http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users > > > _______________________________________________ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
