Closed
Bug 807896
Opened 12 years ago
Closed 12 years ago
Reduce the initial size of SPS's strings hashtable
Categories
(Core :: JavaScript Engine, defect)
Core
JavaScript Engine
Tracking
()
RESOLVED
FIXED
mozilla19
People
(Reporter: n.nethercote, Assigned: n.nethercote)
References
Details
(Whiteboard: [MemShrink])
Attachments
(1 file)
785 bytes,
patch
|
u443197
:
review+
bajaj
:
approval-mozilla-aurora+
|
Details | Diff | Splinter Review |
SPSProfiler::strings is initialized like this: strings.init(max) and in Gecko |max| is 1,024. This ends up giving us a hashtable with 2,048 entries, which takes up 24,576 bytes on 32-bit platforms, and 49,152 bytes on 64-bit platforms. This is overkill.
Assignee | ||
Comment 1•12 years ago
|
||
This patch causes the hashtable to initialize to the default size (32 entries), which results in a 512 byte table on 32-bit platforms and a 1,024 byte table on 64-bit platforms. This avoids wasting space when SPS isn't used, and when SPS is used the table will quickly grow (with negligible overhead) to a suitable size (which may still be substantially less than 2,048 entries). This is a tiny win, but hey! It's a tiny patch. And it saves me from having to see it come up in memory profiles all the time.
Attachment #677659 -
Flags: review?(alex)
Assignee | ||
Updated•12 years ago
|
Blocks: B2GDarkMatter
Whiteboard: [MemShrink]
Attachment #677659 -
Flags: review?(alex) → review+
Assignee | ||
Comment 2•12 years ago
|
||
https://hg.mozilla.org/integration/mozilla-inbound/rev/52feef2d0c8e
Assignee | ||
Comment 3•12 years ago
|
||
Comment on attachment 677659 [details] [diff] [review] Reduce the initial size of SPS's strings hashtable. [Approval Request Comment] Bug caused by (feature/regressing bug #): N/A. User impact if declined: slightly higher memory consumption on B2G; the patch saves 24 KiB per B2G process. Testing completed (on m-c, etc.): just landed on m-c. Risk to taking this patch (and alternatives if risky): negligible. It just reduces the initial size of a hashtable that's only used if the SPS profiler is enabled. (There's no functionality change; the table will grow as needed if the SPS profiler is enabled.) String or UUID changes made by this patch:
Attachment #677659 -
Flags: approval-mozilla-aurora?
Comment 4•12 years ago
|
||
https://hg.mozilla.org/mozilla-central/rev/52feef2d0c8e
Status: NEW → RESOLVED
Closed: 12 years ago
Resolution: --- → FIXED
Target Milestone: --- → mozilla19
Updated•12 years ago
|
Attachment #677659 -
Flags: approval-mozilla-aurora? → approval-mozilla-aurora+
Comment 5•12 years ago
|
||
https://hg.mozilla.org/releases/mozilla-aurora/rev/07bbdd455716
status-firefox18:
--- → fixed
status-firefox19:
--- → fixed
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Description
•