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Old 07-03-2012, 02:39 PM
Dave Anderson
 
Default crash: Add Snappy Compression Support

----- Original Message -----
> This patch series add snappy compression support for crash utility,
> applied on top of v6.0.8.
>
> snappy is fast compressoin algorhythm like lzo, but it's more
> optimized than lzo on x86 machines and some other archs.
>
> A lot of benchmark is available on the web. Here I only point at my
> benchmark I posted a few weeks ago,
>
> - http://lists.infradead.org/pipermail/kexec/2012-June/006425.html
>
> where snappy shows mostly as good performance as simple copying on
> the worst case that input data increases its data size during
> compression; this means we can use snappy with mostly NO risk.
>
> How to get snappy libraries:
>
> 1) Use yum framework to get snappy and snappy-devel packages, or
>
> 2) Visit official website: http://code.google.com/p/snappy/,
> download snappy-<version>.tar.gz and then build it.
>
> How to build crash utility with snappy support:
>
> 1) Put -DSNAPPY in CFLAGS.extra file and put -lsnappy in LDFRAGS.extra file.
>
> 2) Do make as always.

The patch is certainly safe enough to accept for crash-6.0.9.

I tried to do a compile-test, but after doing a "yum install snappy" on
a RHEL5 machine, where it grabbed the package from an EPEL repository
since it's not a supported RHEL5 (or RHEL6) package, I see the i386 and
x86_64 packages:

$ rpm -qa | grep snappy
snappy-1.0.5-1.el5
snappy-1.0.5-1.el5
$

And its libraries:

$ ls /usr/lib64/*snappy* /usr/lib/*snappy*
/usr/lib64/libsnappy.so.1@ /usr/lib64/libsnappy.so.1.1.3* /usr/lib/libsnappy.so.1@ /usr/lib/libsnappy.so.1.1.3*
$

But for whatever reason, there's no /usr/include/snappy-c.h file:

$ find /usr/include -name "snappy*"
$

And so the build fails:

$ make
TARGET: X86_64
CRASH: 6.0.9rc2
GDB: 7.3.1

cc -c -g -DX86_64 -DSNAPPY -DGDB_7_3_1 build_data.c -Wall -O2 -Wstrict-prototypes -Wmissing-prototypes -fstack-protector
cc -c -g -DX86_64 -DSNAPPY -DGDB_7_3_1 main.c -Wall -O2 -Wstrict-prototypes -Wmissing-prototypes -fstack-protector
In file included from main.c:18:
defs.h:55:22: error: snappy-c.h: No such file or directory
make[3]: *** [main.o] Error 1
make[2]: *** [gdb] Error 2
make[1]: *** [gdb_merge] Error 2
make: *** [all] Error 2
$

Although I do see the header file in the upstream snappy-1.0.5.tar.gz package.

Anyway, the patch is queued for crash-6.0.9.

Thanks,
Dave

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