616441 - Defragment Startup cache upon exit

Status: RESOLVED INVALID

(Firefox :: General, defect)

Description

[Christopher Chan]

User-Agent:       Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0b7) Gecko/20100101 Firefox/4.0b7
Build Identifier: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0b7) Gecko/20100101 Firefox/4.0b7

By defragmenting the files in the startupcache folder and urlclassifier3.sqlite using PerfectDisk, I get a 7-second win in startup time.  By defraging the files when exiting Firefox, the startup time required will be greatly reduced next time.

Reproducible: Always

Comment 2

[Christopher Chan]

I had reviewed bug 593349 before reporting this bug.  Bug 593349 aims to reduce fragmentation during the write process while my bug focus on defraging the startup cache and has nothing to do with its writing algorithms.  Although they may lead to similar results (less fragments), the combined approach will make the result much more conspicious and effective. So I personally don't think it's a duplicate.

Comment 3

[(dormant account)]

(In reply to comment #2)
> I had reviewed bug 593349 before reporting this bug.  Bug 593349 aims to reduce
> fragmentation during the write process while my bug focus on defraging the
> startup cache and has nothing to do with its writing algorithms.  Although they
> may lead to similar results (less fragments), the combined approach will make
> the result much more conspicious and effective. So I personally don't think
> it's a duplicate.

We can't actively defrag in firefox as that requires administrator privileges. The best we can do is try to avoid causing extra fragmentation. That said, this could be done from an addon that the user would opt in to.

Also windows is supposed to defragment periodically(once a week on hard drives).