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Fix the sliding mmap buffer not working on 2nd pass onwards which was causing a slowdon of death.

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Con Kolivas 2010-11-20 09:44:54 +11:00
parent 13ca377279
commit 6929492874
3 changed files with 9 additions and 4 deletions
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1
ChangeLog
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@ -6,6 +6,7 @@ NOVEMBER 2010, version 0.542 Con Kolivas
* Minor tweaks to output.
* Round up the size of the high buffer in sliding mmap to one page.
* Squeeze a little more out of 32 bit compression windows.
* Fix sliding mmap from not working on 2nd pass onwards.
NOVEMBER 2010, version 0.541 Con Kolivas
* Fix wrong number of passes reported.

2
WHATS-NEW
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@ -8,6 +8,8 @@ buffer for better performance.
The progress output is more informative in max verbose mode, and will no longer
do more passes than it estimates.
32 bit machines should be able to use slightly larger windows.
The sliding mmap not working on 2nd pass onwards has been fixed which should
speed up the slowdown of death.
lrzip-0.540

10
rzip.c
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@ -99,6 +99,7 @@ struct sliding_buffer {
i64 size_high; /* "" high "" */
i64 high_length;/* How big the high buffer should be */
int fd; /* The fd of the mmap */
int low_top; /* The low buffer has hit the top */
} sb; /* Sliding buffer */
static void round_to_page(i64 *size)
@ -108,15 +109,14 @@ static void round_to_page(i64 *size)
static void remap_low_sb(void)
{
static int top = 0;
i64 new_offset;
if (top)
if (sb.low_top)
return;
new_offset = sb.offset_search;
if (new_offset + sb.size_low > sb.orig_size) {
new_offset = sb.orig_size - sb.size_low;
top = 1;
sb.low_top = 1;
}
round_to_page(&new_offset);
print_maxverbose("Sliding main buffer to offset %lld\n", new_offset);
@ -684,6 +684,7 @@ static void init_sliding_mmap(struct rzip_state *st, int fd_in, i64 offset)
sb.size_high = sb.high_length;
sb.offset_high = 0;
}
sb.low_top = 0;
sb.offset_low = 0;
sb.offset_search = 0;
sb.size_low = st->mmap_size;
@ -765,8 +766,9 @@ void rzip_fd(int fd_in, int fd_out)
control.max_mmap = MIN(control.max_mmap, two_gig / 3);
round_to_page(&control.max_mmap);
/* Set maximum chunk size to ram size. */
if (MAXRAM && !STDIN)
control.max_chunk = control.max_mmap / 2 * 3;
control.max_chunk = control.ramsize;
else
control.max_chunk = control.max_mmap;
if (UNLIMITED)