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document memory efficiency

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This puts some numbers of library size with the various --without
and --disable options and about dynamic memory allocation
performance

Signed-off-by: Andy Green <andy.green@linaro.org>
This commit is contained in:
Andy Green 2013-01-20 20:14:42 +08:00
parent a17c692cd3
commit 5c81e804fa
1 changed files with 47 additions and 0 deletions
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47
README.build
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@ -26,6 +26,14 @@ disabled when building this way
For uClibc, you will likely need --enable-builtin-getifaddrs
For cross-building, here's an example using the Linaro ARM toolchain
./configure --prefix=/usr --host=arm-linux-gnueabi --without-client --without-extensions
you can build cross with client and extensions perfectly well, but
apart from the size shrink this has the nice characteristic that no
non-toolchain libraries are needed to build it.
otherwise if /usr/local/... and /usr/local/lib are OK then...
@ -174,3 +182,42 @@ echo "65536" > /proc/sys/net/core/somaxconn
echo "65536" > /proc/sys/net/ipv4/tcp_max_syn_backlog
echo "262144" > /proc/sys/net/netfilter/nf_conntrack_max
Memory efficiency
-----------------
This shows the impact of the major configuration with/without options at
13ba5bbc633ea962d46d using Ubuntu ARM on a PandaBoard ES.
These are accounting for static allocations from the library elf, there are
additional dynamic allocations via malloc
Static allocations, ARM9
.text .rodata .data .bss
All (no without) 35024 9940 336 4104
without client 25684 7144 336 4104
without client, exts 21652 6288 288 4104
without client, exts, debug[1] 19756 3768 288 4104
without server 30304 8160 336 4104
without server, exts 25382 7204 288 4104
without server, exts, debug[1] 23712 4256 288 4104
Dynamic allocations: ARM9 (32 bit)
Context Creation, 1024 fd limit[2] in ulimit: 12288 (12 bytes per fd)
Per-connection (excluding headers[3]): 8740
Dynamic allocations: x86_64 (64 bit)
Context Creation, 1024 fd limit[2] in ulimit: 16384 (16 bytes per fd)
Per-connection (excluding headers[3]): 9224
[1] --disable-debug only removes messages below lwsl_notice. Since that is
the default logging level the impact is not noticable, error, warn and notice
logs are all still there.
[2] 1024 fd per process is the default limit (set by ulimit) in at least Fedora
and Ubuntu.
[3] known headers are retained via additional mallocs for the lifetime of the
connection