On Jul 22, 2009 23:59 -0500, Eric Sandeen wrote:
> Theodore Tso wrote:
> > Here's the output on my root filesystem (which has been in use since
> > February):
> >
> > Total chunks: 71681
> > Free chunks: 21792 (30.4%)
> >
> > Min free chunk: 4 KB
> > Max free chunk: 568232 KB
> > Avg free chunk: 184 KB
> >
> > HISTOGRAM OF FREE CHUNK SIZES:
> > Chunk Size Range : Free chunks
> > 4K... 8K- : 35005
> > 8K... 16K- : 33639
:
:
> > 128M... 256M- : 8
> > 512M... 1024M- : 1
> >
> > Yeah.... pretty fragmented. :-(
> >
>
>
> Just for comparison, here's a 30G xfs root that has run for a year or
> two, currently about 70% full:
>
> xfs_db> freesp -s
> from to extents blocks pct
> 1 1 1849 1849 0.08
> 2 3 1383 3293 0.14
:
:
> 262144 524287 1 509811 21.91
> 524288 1048575 1 554838 23.85
> total free extents 7153
> total free blocks 2326556
> average free extent size 325.256
I like the printing of the total blocks in each section and the
percent of blocks... Attached is an incremental patch that adds
the same to e2freefrag.
Cheers, Andreas
--
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.
--- ./misc/e2freefrag.c 2009-07-23 11:02:38.000000000 -0600
+++ ./misc/e2freefrag.c.new 2009-07-23 10:52:22.000000000 -0600
@@ -60,8 +60,10 @@ void init_chunk_info(ext2_filsys fs, str
info->max = info->avg = 0;
info->real_free_chunks = 0;
- for (i = 0; i < MAX_HIST; i++)
- info->histogram.fc_buckets[i] = 0;
+ for (i = 0; i < MAX_HIST; i++) {
+ info->histogram.fc_chunks[i] = 0;
+ info->histogram.fc_blocks[i] = 0;
+ }
}
void scan_block_bitmap(ext2_filsys fs, struct chunk_info *info)
@@ -101,7 +103,9 @@ void scan_block_bitmap(ext2_filsys fs, s
unsigned long index;
index = ul_log2(last_chunk_size) + 1;
- info->histogram.fc_buckets[index]++;
+ info->histogram.fc_chunks[index]++;
+ info->histogram.fc_blocks[index] +=
+ last_chunk_size;
if (last_chunk_size > info->max)
info->max = last_chunk_size;
@@ -137,7 +141,7 @@ errcode_t get_chunk_info(ext2_filsys fs,
printf("\nChunksize: %u bytes (%u blocks)\n",
info->chunkbytes, info->blks_in_chunk);
total_chunks = (fs->super->s_blocks_count + info->blks_in_chunk) >>
- (info->chunkbits - info->blocksize_bits);
+ (info->chunkbits - info->blocksize_bits);
printf("Total chunks: %lu\nFree chunks: %lu (%0.1f%%)\n",
total_chunks, info->free_chunks,
(double)info->free_chunks * 100 / total_chunks);
@@ -156,12 +160,17 @@ errcode_t get_chunk_info(ext2_filsys fs,
"Avg free chunk: %lu KB\n", info->min, info->max, info->avg);
printf("\nHISTOGRAM OF FREE CHUNK SIZES:\n");
- printf("%15s\t\t%10s\n", "Range", "Free chunks");
+ printf("%s : %12s %12s %7s\n", "Chunk Size Range", "Free chunks",
+ "Free Blocks", "Percent");
for (i = 0; i < MAX_HIST; i++) {
end = 1 << (i + info->blocksize_bits - units);
- if (info->histogram.fc_buckets[i] != 0)
- printf("%5lu%c...%5lu%c- : %10lu\n", start, *unitp,
- end, *unitp, info->histogram.fc_buckets[i]);
+ if (info->histogram.fc_chunks[i] != 0)
+ printf("%5lu%c...%5lu%c- : %12lu %12lu %6.1f%%\n",
+ start, *unitp, end, *unitp,
+ info->histogram.fc_chunks[i],
+ info->histogram.fc_blocks[i],
+ (double)info->histogram.fc_blocks[i] * 100 /
+ fs->super->s_free_blocks_count);
start = end;
if (start == 1<<10) {
start = 1;
--- ./misc/e2freefrag.h 2009-07-23 11:02:38.000000000 -0600
+++ ./misc/e2freefrag.h.new 2009-07-23 10:52:26.000000000 -0600
@@ -4,7 +4,8 @@
#define MAX_HIST 32
struct free_chunk_histogram {
- unsigned long fc_buckets[MAX_HIST];
+ unsigned long fc_chunks[MAX_HIST];
+ unsigned long fc_blocks[MAX_HIST];
};
struct chunk_info {
--- ./misc/e2freefrag.8.in 2009-07-23 11:02:38.000000000 -0600
+++ ./misc/e2freefrag.8.in.new 2009-07-23 11:05:13.000000000 -0600
@@ -44,53 +44,53 @@ is specified on the command line, then t
.br
Blocksize: 4096 bytes
.br
-Total blocks: 5120710
+Total blocks: 1504085
.br
-Free blocks: 831744 (16.2%)
+Free blocks: 292995 (19.5%)
.br
Chunk size: 1048576 bytes (256 blocks)
.br
-Total chunks: 20003
+Total chunks: 5876
.br
-Free chunks: 2174 (10.9%)
+Free chunks: 463 (7.9%)
.br
Min free chunk: 4 KB
.br
-Max free chunk: 24576 KB
+Max free chunk: 24008 KB
.br
-Avg. free chunk: 340 KB
+Avg free chunk: 252 KB
.br
HISTOGRAM OF FREE CHUNK SIZES:
.br
- Range Free chunks
+Chunk Size Range : Free chunks Free Blocks Percent
.br
- 4K... 8K- : 2824
+ 4K... 8K- : 704 704 0.2%
.br
- 8K... 16K- : 1760
+ 8K... 16K- : 810 1979 0.7%
.br
- 16K... 32K- : 1857
+ 16K... 32K- : 843 4467 1.5%
.br
- 32K... 64K- : 1003
+ 32K... 64K- : 579 6263 2.1%
.br
- 64K... 128K- : 616
+ 64K... 128K- : 493 11067 3.8%
.br
- 128K... 256K- : 479
+ 128K... 256K- : 394 18097 6.2%
.br
- 256K... 512K- : 302
+ 256K... 512K- : 281 25477 8.7%
.br
- 512K... 1024K- : 238
+ 512K... 1024K- : 253 44914 15.3%
.br
- 1M... 2M- : 213
+ 1M... 2M- : 143 51897 17.7%
.br
- 2M... 4M- : 173
+ 2M... 4M- : 73 50683 17.3%
.br
- 4M... 8M- : 287
+ 4M... 8M- : 37 52417 17.9%
.br
- 8M... 16M- : 4
+ 8M... 16M- : 7 19028 6.5%
.br
- 16M... 32M- : 1
+ 16M... 32M- : 1 6002 2.0%
.SH AUTHOR
This version of e2freefrag was written by Rupesh Thakare, and modified by
Andreas Dilger <adilger@xxxxxxx>, and Kalpak Shah.
