== sanity test 255a: check 'lfs ladvise -a willread' ===== 15:06:12 (1776193572)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 3.40213 s, 30.8 MB/s
ladvise: range [2, 1] is invalid
Provide servers with advice about access patterns for a file.
usage: ladvise [--advice|-a ADVICE] [--start|-s START[kMGT]]
               [--background|-b] [--unset|-u]

               {--end|-e END[kMGT]|--length|-l LENGTH[kMGT]}
               {[--mode|-m [READ,WRITE]}
               <file> ...

ladvise: range [2, 2] is invalid
Provide servers with advice about access patterns for a file.
usage: ladvise [--advice|-a ADVICE] [--start|-s START[kMGT]]
               [--background|-b] [--unset|-u]

               {--end|-e END[kMGT]|--length|-l LENGTH[kMGT]}
               {[--mode|-m [READ,WRITE]}
               <file> ...

ladvise: conflicting arguments of -l and -e
Provide servers with advice about access patterns for a file.
usage: ladvise [--advice|-a ADVICE] [--start|-s START[kMGT]]
               [--background|-b] [--unset|-u]

               {--end|-e END[kMGT]|--length|-l LENGTH[kMGT]}
               {[--mode|-m [READ,WRITE]}
               <file> ...

Synchronous ladvise should wait
fail_val=4
fail_loc=0x237
Asynchronous ladvise shouldn't wait
fail_loc=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.459328
Iter 1/10: OSS cache speed: 0.444943
Iter 1/10: ladvise speed: 0.428822
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.435954
Iter 2/10: OSS cache speed: 0.458566
Iter 2/10: ladvise speed: 0.484227
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.446108
Iter 3/10: OSS cache speed: 0.529732
Iter 3/10: ladvise speed: 0.465252
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.498869
Iter 4/10: OSS cache speed: 0.469382
Iter 4/10: ladvise speed: 0.426676
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.508259
Iter 5/10: OSS cache speed: 0.534652
Iter 5/10: ladvise speed: 0.466943
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.517186
Iter 6/10: OSS cache speed: 0.53018
Iter 6/10: ladvise speed: 0.552235
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.529578
Iter 7/10: OSS cache speed: 0.542443
Iter 7/10: ladvise speed: 0.514496
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.500681
Iter 8/10: OSS cache speed: 0.489779
Iter 8/10: ladvise speed: 0.520142
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.464844
Iter 9/10: OSS cache speed: 0.529347
Iter 9/10: ladvise speed: 0.574853
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.500644
Iter 10/10: OSS cache speed: 0.528045
Iter 10/10: ladvise speed: 0.517483
Average uncached read: .48
Average speedup with OSS cached read:  .50 = +4.16%
Average speedup with ladvise willread:  .49 = +2.08%
/home/green/git/lustre-release/lustre/tests/sanity.sh: line 21950: 0ϵC: < 20 : syntax error: operand expected (error token is "< 20 ")
lfs ladvise: cannot give advice: Unknown error 524 (524)
ladvise: cannot give advice 'dontneed' to file '/mnt/lustre/f255a.sanity': Unknown error 524
osd-zfs does not support dontneed or drop_caches