== sanity test 255a: check 'lfs ladvise -a willread' ===== 07:44:06 (1764938646)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 2.3833 s, 44.0 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: 0.597538
Iter 1/10: OSS cache speed: 0.578695
Iter 1/10: ladvise speed: 0.559369
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.637396
Iter 2/10: OSS cache speed: 0.606707
Iter 2/10: ladvise speed: 0.568863
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.568957
Iter 3/10: OSS cache speed: 0.630874
Iter 3/10: ladvise speed: 0.644764
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.679526
Iter 4/10: OSS cache speed: 0.660556
Iter 4/10: ladvise speed: 0.567099
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.475031
Iter 5/10: OSS cache speed: 0.557055
Iter 5/10: ladvise speed: 0.564925
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.611045
Iter 6/10: OSS cache speed: 0.678528
Iter 6/10: ladvise speed: 0.742492
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.782686
Iter 7/10: OSS cache speed: 0.811876
Iter 7/10: ladvise speed: 0.859322
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.862159
Iter 8/10: OSS cache speed: 0.833912
Iter 8/10: ladvise speed: 0.877861
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 1.01818
Iter 9/10: OSS cache speed: 1.07971
Iter 9/10: ladvise speed: 1.28119
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 1.29469
Iter 10/10: OSS cache speed: 1.31242
Iter 10/10: ladvise speed: 1.29134
Average uncached read: .75
Average speedup with OSS cached read:  .77 = +2.66%
Average speedup with ladvise willread:  .79 = +5.33%
/home/green/git/lustre-release/lustre/tests/sanity.sh: line 21886: Pu5cU: < 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