[Crash-utility] [PATCH 0/3] crash: Add Snappy Compression Support

[Dave Anderson]

----- Original Message -----
> 
> 
> ----- 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

Never mind -- I missed the part about also installing the "snappy-devel" package...

Dave