GitHub user bgaff opened a pull request:
https://github.com/apache/trafficserver/pull/556
Adding STL Allocator which uses io bufs
This is something that seems to come up at every summit and I always
promise to prototype it. Ahead of the next summit I'd like to begin discussions
around the idea of actually making this happen. This pull request (while not
yet referencing a TS ticket) adds an STL allocator which uses io bufs if
possible falling back to std::allocator for large allocations. As an example I
also modified the SPDY code to use this new allocator instead of the default
allocator. So I'd love thoughts on this, should we go forward?
cc. @jpeach @SolidWallOfCode @zwoop @jacksontj
The result below is from just switching out the SPDY code and with only ONE
request, needless-to-say a large number of allocations happen that can be
deferred to an io buf.
```
[Mar 1 23:50:12.861] Server {0x7fffee0fc700} DIAG: (allocator) Allocating
a block from iobuf index 0 (block size 128), alloc size = 30 at location
0x7fffd004bf80
[Mar 1 23:50:12.861] Server {0x7fffee0fc700} DIAG: (allocator) Allocating
a block from iobuf index 0 (block size 128), alloc size = 34 at location
0x7fffd004bf00
[Mar 1 23:50:12.861] Server {0x7fffee0fc700} DIAG: (allocator) Allocating
a block from iobuf index 0 (block size 128), alloc size = 16 at location
0x7fffd004be80
[Mar 1 23:50:12.861] Server {0x7fffee0fc700} DIAG: (allocator) Allocating
a block from iobuf index 0 (block size 128), alloc size = 32 at location
0x7fffd004be00
[Mar 1 23:50:12.861] Server {0x7fffee0fc700} DIAG: (allocator) Allocating
a block from iobuf index 0 (block size 128), alloc size = 28 at location
0x7fffd004bd80
[Mar 1 23:50:12.861] Server {0x7fffee0fc700} DIAG: (allocator) Allocating
a block from iobuf index 0 (block size 128), alloc size = 32 at location
0x7fffd004bd00
[Mar 1 23:50:12.861] Server {0x7fffee0fc700} DIAG: (allocator)
Deallocating a block to iobuf index 0 (block size 128), alloc size = 16 at
location 0x7fffd004bc80
[Mar 1 23:50:12.861] Server {0x7fffee0fc700} DIAG: (allocator) Allocating
a block from iobuf index 0 (block size 128), alloc size = 30 at location
0x7fffd004bc80
[Mar 1 23:50:12.861] Server {0x7fffee0fc700} DIAG: (allocator) Allocating
a block from iobuf index 0 (block size 128), alloc size = 26 at location
0x7fffd004bc00
[Mar 1 23:50:12.861] Server {0x7fffee0fc700} DIAG: (allocator) Allocating
a block from iobuf index 0 (block size 128), alloc size = 64 at location
0x7fffd004bb80
[Mar 1 23:50:12.861] Server {0x7fffee0fc700} DIAG: (allocator)
Deallocating a block to iobuf index 0 (block size 128), alloc size = 32 at
location 0x7fffd004bb00
[Mar 1 23:50:12.861] Server {0x7fffee0fc700} DIAG: (allocator) Allocating
a block from iobuf index 0 (block size 128), alloc size = 32 at location
0x7fffd004bb00
[Mar 1 23:50:12.861] Server {0x7fffee0fc700} DIAG: (allocator) Allocating
a block from iobuf index 0 (block size 128), alloc size = 30 at location
0x7fffd004ba80
[Mar 1 23:50:12.861] Server {0x7fffee0fc700} DIAG: (allocator) Allocating
a block from iobuf index 0 (block size 128), alloc size = 33 at location
0x7fffd004ba00
[Mar 1 23:50:12.861] Server {0x7fffee0fc700} DIAG: (allocator) Allocating
a block from iobuf index 0 (block size 128), alloc size = 33 at location
0x7fffd004b980
[Mar 1 23:50:12.861] Server {0x7fffee0fc700} DIAG: (allocator) Allocating
a block from iobuf index 0 (block size 128), alloc size = 128 at location
0x7fffd004b900
[Mar 1 23:50:12.861] Server {0x7fffee0fc700} DIAG: (allocator)
Deallocating a block to iobuf index 0 (block size 128), alloc size = 64 at
location 0x7fffd004b880
[Mar 1 23:50:12.861] Server {0x7fffee0fc700} DIAG: (allocator) Allocating
a block from iobuf index 0 (block size 128), alloc size = 31 at location
0x7fffd004b880
[Mar 1 23:50:12.861] Server {0x7fffee0fc700} DIAG: (allocator) Allocating
a block from iobuf index 0 (block size 128), alloc size = 28 at location
0x7fffd004b800
[Mar 1 23:50:12.861] Server {0x7fffee0fc700} DIAG: (allocator) Allocating
a block from iobuf index 0 (block size 128), alloc size = 40 at location
0x7fffd004b780
[Mar 1 23:50:12.861] Server {0x7fffee0fc700} DIAG: (allocator) Allocating
a block from iobuf index 0 (block size 128), alloc size = 38 at location
0x7fffd004b700
[Mar 1 23:50:12.861] Server {0x7fffee0fc700} DIAG: (allocator) Allocating
a block from iobuf index 0 (block size 128), alloc size = 35 at location
0x7fffd004b680
[Mar 1 23:50:12.861] Server {0x7fffee0fc700} DIAG: (allocator) Allocating
a block from iobuf index 0 (block size 128), alloc size = 42 at location
0x7fffd004b600
[Mar 1 23:50:12.861] Server {0x7fffee0fc700} DIAG: (allocator) Allocating
a block from iobuf index 0 (block size 128), alloc size = 48 at location
0x7fffd004b580
[Mar 1 23:50:12.861] Server {0x7fffee0fc700} DIAG: (allocator) Allocating
a block from iobuf index 0 (block size 128), alloc size = 35 at location
0x7fffd004b500
[Mar 1 23:50:12.861] Server {0x7fffee0fc700} DIAG: (allocator) Allocating
a block from iobuf index 0 (block size 128), alloc size = 45 at location
0x7fffd004b480
[Mar 1 23:50:12.861] Server {0x7fffee0fc700} DIAG: (allocator) Allocating
a block from iobuf index 0 (block size 128), alloc size = 43 at location
0x7fffd004b400
[Mar 1 23:50:12.861] Server {0x7fffee0fc700} DIAG: (allocator)
Deallocating a block to iobuf index 0 (block size 128), alloc size = 45 at
location 0x7fffd004b380
[Mar 1 23:50:12.861] Server {0x7fffee0fc700} DIAG: (allocator)
Deallocating a block to iobuf index 0 (block size 128), alloc size = 35 at
location 0x7fffd004b380
[Mar 1 23:50:13.309] Server {0x7fffee0fc700} DIAG: (allocator)
Deallocating a block to iobuf index 0 (block size 128), alloc size = 30 at
location 0x7fffd004b380
[Mar 1 23:50:13.309] Server {0x7fffee0fc700} DIAG: (allocator)
Deallocating a block to iobuf index 0 (block size 128), alloc size = 32 at
location 0x7fffd004b380
[Mar 1 23:50:13.309] Server {0x7fffee0fc700} DIAG: (allocator)
Deallocating a block to iobuf index 0 (block size 128), alloc size = 30 at
location 0x7fffd004b380
[Mar 1 23:50:13.309] Server {0x7fffee0fc700} DIAG: (allocator)
Deallocating a block to iobuf index 0 (block size 128), alloc size = 32 at
location 0x7fffd004b380
[Mar 1 23:50:13.309] Server {0x7fffee0fc700} DIAG: (allocator)
Deallocating a block to iobuf index 0 (block size 128), alloc size = 33 at
location 0x7fffd004b380
[Mar 1 23:50:13.309] Server {0x7fffee0fc700} DIAG: (allocator)
Deallocating a block to iobuf index 0 (block size 128), alloc size = 28 at
location 0x7fffd004b380
[Mar 1 23:50:13.309] Server {0x7fffee0fc700} DIAG: (allocator)
Deallocating a block to iobuf index 0 (block size 128), alloc size = 31 at
location 0x7fffd004b380
[Mar 1 23:50:13.309] Server {0x7fffee0fc700} DIAG: (allocator)
Deallocating a block to iobuf index 0 (block size 128), alloc size = 38 at
location 0x7fffd004b380
[Mar 1 23:50:13.309] Server {0x7fffee0fc700} DIAG: (allocator)
Deallocating a block to iobuf index 0 (block size 128), alloc size = 40 at
location 0x7fffd004b380
[Mar 1 23:50:13.309] Server {0x7fffee0fc700} DIAG: (allocator)
Deallocating a block to iobuf index 0 (block size 128), alloc size = 42 at
location 0x7fffd004b380
[Mar 1 23:50:13.309] Server {0x7fffee0fc700} DIAG: (allocator)
Deallocating a block to iobuf index 0 (block size 128), alloc size = 35 at
location 0x7fffd004b380
[Mar 1 23:50:13.309] Server {0x7fffee0fc700} DIAG: (allocator)
Deallocating a block to iobuf index 0 (block size 128), alloc size = 128 at
location 0x7fffd004b380
[Mar 1 23:50:13.309] Server {0x7fffee0fc700} DIAG: (allocator)
Deallocating a block to iobuf index 0 (block size 128), alloc size = 43 at
location 0x7fffd004b380
[Mar 1 23:50:13.309] Server {0x7fffee0fc700} DIAG: (allocator)
Deallocating a block to iobuf index 0 (block size 128), alloc size = 34 at
location 0x7fffd004b380
[Mar 1 23:50:13.309] Server {0x7fffee0fc700} DIAG: (allocator)
Deallocating a block to iobuf index 0 (block size 128), alloc size = 26 at
location 0x7fffd004b380
[Mar 1 23:50:13.309] Server {0x7fffee0fc700} DIAG: (allocator)
Deallocating a block to iobuf index 0 (block size 128), alloc size = 30 at
location 0x7fffd004b380
[Mar 1 23:50:13.309] Server {0x7fffee0fc700} DIAG: (allocator)
Deallocating a block to iobuf index 0 (block size 128), alloc size = 28 at
location 0x7fffd004b380
[Mar 1 23:50:13.309] Server {0x7fffee0fc700} DIAG: (allocator)
Deallocating a block to iobuf index 0 (block size 128), alloc size = 33 at
location 0x7fffd004b380
[Mar 1 23:50:13.309] Server {0x7fffee0fc700} DIAG: (allocator)
Deallocating a block to iobuf index 0 (block size 128), alloc size = 48 at
location 0x7fffd004b380
```
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/bgaff/trafficserver master
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/trafficserver/pull/556.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #556
----
commit e862fbf214a88e6fa66276de7f9dd198db5ac2ef
Author: Brian Geffon <bri...@apache.org>
Date: 2016-03-02T07:56:08Z
Adding STL Allocator which uses IoBufs
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