Closing browser window causes disk thrashing due to writing out entire bookmarks file, and using excessive fsyncing

RESOLVED DUPLICATE of bug 101319

Status

RESOLVED DUPLICATE of bug 101319
16 years ago
14 years ago

People

(Reporter: gareth.randall, Assigned: bugs)

Tracking

Trunk
x86
Linux

Firefox Tracking Flags

(Not tracked)

Details

(URL)

(Reporter)

Description

16 years ago
User-Agent:       Mozilla/5.0 (X11; U; Linux i586; en-US; rv:1.2.1) Gecko/20021130
Build Identifier: Mozilla/5.0 (X11; U; Linux i586; en-US; rv:1.2.1) Gecko/20021130

Mozilla writes out the entire bookmarks file every time a browser window (not a
tab) is closed. I have determined this using "strace". I get hundreds of lines
like this:

write(24, "<!DOCTYPE NETSCAPE-Bookmark-file"..., 4096) = 4096
fsync(24)
....

close(24)
and later a rename.

Basically, calling "fsync" after each 4096 byte lump, causes a long delay (up to
2 seconds) on journalled filesystems and doesn't seem to be necessary. This
causes a long wait upon closing a browser window, or a pop-up for instance.

(In fact, is it even necessary to write the bookmarks out for each close anyway?)


Reproducible: Always

Steps to Reproduce:
1. Attach a tracer using "strace -p [first Mozilla PID]"
2. Open a new browser window. (Ctrl+N)
3. Close the same browser window.
4. Observe the time lag, and huge stream of disk writes in strace.

Actual Results:  
See description.

Expected Results:  
Not called fsync after each partial write.

*** This bug has been marked as a duplicate of 101319 ***
Status: UNCONFIRMED → RESOLVED
Last Resolved: 16 years ago
Resolution: --- → DUPLICATE
Product: Browser → Seamonkey
You need to log in before you can comment on or make changes to this bug.