Updates:
Status: Invalid
Comment #5 on issue 20821 by [email protected]: fs_usage shows that Chrome
is reading and writing on the disk several times every second.
http://code.google.com/p/chromium/issues/detail?id=20821
It's not "several times every second". When Chromium is sitting idle with
no user
interaction, it hits the disk every 30s.
If we use the commandline:
sudo fs_usage -w -f filesys Chromium
We see on idle:
11:14:13.303 write F=13 B=0x1
0.000013 Chromium
11:14:13.303 read F=12 B=0x1
0.000004 Chromium
11:14:43.303 write F=13 B=0x1
0.000011 Chromium
11:14:43.303 read F=12 B=0x1
0.000004 Chromium
11:15:13.303 write F=13 B=0x1
0.000012 Chromium
11:15:13.303 read F=12 B=0x1
0.000004 Chromium
When we move the mouse around, we are pounding fds 12 and 13 quite a bit:
11:13:16.628 read F=12 B=0x1
0.000005 Chromium
11:13:16.645 write F=13 B=0x1
0.000018 Chromium
11:13:16.645 read F=12 B=0x1
0.000004 Chromium
11:13:16.662 write F=13 B=0x1
0.000015 Chromium
11:13:16.662 read F=12 B=0x1
0.000004 Chromium
11:13:16.679 write F=13 B=0x1
0.000009 Chromium
11:13:16.679 read F=12 B=0x1
0.000003 Chromium
11:13:16.695 write F=13 B=0x1
0.000008 Chromium
11:13:16.695 read F=12 B=0x1
0.000003 Chromium
11:13:16.712 write F=13 B=0x1
0.000010 Chromium
11:13:16.712 read F=12 B=0x1
0.000004 Chromium
11:13:16.729 write F=13 B=0x1
0.000009 Chromium
11:13:16.729 read F=12 B=0x1
0.000004 Chromium
What are fd 12 and 13? lsof says:
Chromium 82403 avi 8 PIPE 0x8738ce8 16384
Chromium 82403 avi 9 PIPE 0x85554b8 16384
Chromium 82403 avi 10r CHR 8,1 0t240 141354372
/dev/urandom
Chromium 82403 avi 11u KQUEUE count=0,
state=0x2
Chromium 82403 avi 12 PIPE 0xccc2ce8 16384
Chromium 82403 avi 13 PIPE 0xccc3328 16384
Chromium 82403 avi 14u unix 0xa2d5770 0t0 ->0xd71e4c8
Chromium 82403 avi 15u REG 14,2 8 31630356
/private/var/folders/zz/zzzivhrRnAmviuee++-HUU++Is6/-Tmp-/org.chromium.5q2xSB
This "hammering" of the disk is really IPC activity which counts as
filesystem
activity for the purposes of fs_usage.
Case closed.
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