Explore using mmap for data file access

Bug #989427 reported by Michael Leinartas on 2012-04-27
12
This bug affects 2 people
Affects Status Importance Assigned to Milestone
whisper
Confirmed
Wishlist
Unassigned

Bug Description

From question: https://answers.launchpad.net/graphite/+question/191807

Original description:

I read in one of the answers (comment #4 in https://answers.launchpad.net/graphite/+question/170794) that carbon-cache keeps writing to both the first and last blocks of each .wsp file.
This means that it has to keep doing lseek+read+write system calls every time it updates the file.
I'm not very familiar with Python but a quick search tells me that it supports mmap (http://docs.python.org/library/mmap.html).
Using mmap(2) could give a huge advantage:
1. No system calls (which are expensive).
2. No copying of data between the process user-space and kernel buffers on each read/write

Changed in graphite:
importance: Undecided → Wishlist
status: New → Confirmed
Sidnei da Silva (sidnei) on 2012-05-08
affects: graphite → whisper
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