If the compiler has asked us to disable use of mmap() on their
platform then we are forced to use git_mmap and its emulation via
pread. In this case large (e.g. 32 MiB) windows for pack access
are simply too big as a command will wind up reading a lot more
data than it will ever need, significantly reducing response time.
To prevent a high latency when NO_MMAP has been selected we now
use a default of 1 MiB for core.packedGitWindowSize. Credit goes
to Linus and Junio for recommending this more reasonable setting.
[jc: upcased the name of the symbolic constant, and made another
hardcoded constant into a symbolic constant while at it. ]
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
int shared_repository = PERM_UMASK;
const char *apply_default_whitespace;
int zlib_compression_level = Z_DEFAULT_COMPRESSION;
-size_t packed_git_window_size = 32 * 1024 * 1024;
-size_t packed_git_limit = 256 * 1024 * 1024;
+size_t packed_git_window_size = DEFAULT_PACKED_GIT_WINDOW_SIZE;
+size_t packed_git_limit = DEFAULT_PACKED_GIT_LIMIT;
int pager_in_use;
int pager_use_color = 1;
extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
extern int git_munmap(void *start, size_t length);
+#define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
+
#else /* NO_MMAP */
#include <sys/mman.h>
+#define DEFAULT_PACKED_GIT_WINDOW_SIZE (32 * 1024 * 1024)
#endif /* NO_MMAP */
+#define DEFAULT_PACKED_GIT_LIMIT (256 * 1024 * 1024)
+
#ifdef NO_SETENV
#define setenv gitsetenv
extern int gitsetenv(const char *, const char *, int);