I can't figure out why lsof on my Mac (10.8.2, MacBook Pro) is so slow.
On my Mac,
lsof takes more than a minute:
$ touch /tmp/testfile $ time lsof /tmp/testfile real 1m16.483s user 0m0.029s sys 1m15.969s
On a typical Linux box, running Ubuntu 12.04,
lsof takes 20 ms:
$ touch /tmp/testfile $ time lsof /tmp/testfile real 0m0.023s user 0m0.008s sys 0m0.012s
The problem persists if I run
lsof -n (to avoid DNS lookups). Further, I tried checking which system calls are made by
dtruss, and found that it's calling
proc_info tens of thousands of times:
$ sudo dtruss lsof /tmp/testfile 2> /tmp/dump $ cat /tmp/dump | sort | uniq -c | sort -nr | head 10000 proc_info(0x2, 0x1199, 0x8) = 1272 0 6876 proc_info(0x2, 0x45, 0x8) = 1272 0 2360 proc_info(0x2, 0x190D, 0x8) = 1272 0 1294 proc_info(0x2, 0xFF, 0x8) = 1272 0 1152 proc_info(0x2, 0x474, 0x8) = 1272 0 1079 proc_info(0x2, 0x2F, 0x8) = 1272 0 709 proc_info(0x2, 0xFE, 0x8) = 1272 0 693 proc_info(0x2, 0x1F, 0x8) = 1272 0 623 proc_info(0x2, 0x11A, 0x8) = 1272 0 528 proc_info(0x2, 0xF7, 0x8) = 1272 0
Any ideas? I've run these tests and obtained the same results using both the version of
lsof included with OS X (4.85) as well as the latest version from ftp://sunsite.ualberta.ca/pub/Mirror/lsof/ (4.87).
(For the curious, the reason I'm frustrated by this performance is that when I drag images to Evernote, it runs
lsof in the process of copying the file, causing my system to hang for a full minute every time I try to insert an image in Evernote.)