Am 24.08.2011 20:46, schrieb Ian Wienand: > Hi, > > We've been carrying a patch to enable gzip big memory options, as it > makes a significant difference to the speed and ESXi is not memory > constrained (well, compared to some tiny embedded system :) > > Enabling the config option on my standard linux box and zipping a > random 250mb file shows an example > > --- small mem --- > 21.85user 0.44system 0:22.35elapsed 99%CPU (0avgtext+0avgdata > 3872maxresident)k > 0inputs+512320outputs (0major+287minor)pagefaults 0swaps > > --- big mem -- > 13.45user 0.46system 0:13.94elapsed 99%CPU (0avgtext+0avgdata > 4208maxresident)k > 0inputs+512088outputs (0major+307minor)pagefaults 0swaps > > Obviously not for everyone, but I think it is a useful config option. > > -i > > --- > archival/Config.src | 10 ++++++++++ > archival/gzip.c | 6 +++++- > 2 files changed, 15 insertions(+), 1 deletions(-) > > diff --git a/archival/Config.src b/archival/Config.src > index 81788ec..9f49081 100644 > --- a/archival/Config.src > +++ b/archival/Config.src > @@ -187,6 +187,16 @@ config FEATURE_GZIP_LONG_OPTIONS > help > Enable use of long options, increases size by about 106 Bytes > > +config GZIP_BIG_MEM > + bool "Trade memory for gzip speed" > + default n > + depends on GZIP > + help > + Enable big memory options for gzip, including larger I/O > + buffers and bigger hash tables. Faster, but uses at least > + twice as much memory. Select if speed is more important than > + memory use. > +
md5sum has an option trade_speed_for_size (somehintg like that) maybe you can model it that way. re, wh > config LZOP > bool "lzop" > default y > diff --git a/archival/gzip.c b/archival/gzip.c > index 403eb4d..967d284 100644 > --- a/archival/gzip.c > +++ b/archival/gzip.c > @@ -81,7 +81,11 @@ aa: 85.1% -- replaced with aa.gz > > /* > =========================================================================== > */ > -#define SMALL_MEM > +#ifdef CONFIG_GZIP_BIG_MEM > +# define BIG_MEM > +#else > +# define SMALL_MEM > +#endif > > #ifndef INBUFSIZ > # ifdef SMALL_MEM _______________________________________________ busybox mailing list [email protected] http://lists.busybox.net/mailman/listinfo/busybox
