== sanity test 255a: check 'lfs ladvise -a willread' ===== 08:29:00 (1787833740)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 15.0693 s, 7.0 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=8
fail_loc=0x237
Asynchronous ladvise shouldn't wait
llite.lustre-ffff8c8f10c34800.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.342392
Iter 1/10: OSS cache speed: 0.345605
Iter 1/10: ladvise speed: 0.40674
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.360226
Iter 2/10: OSS cache speed: 0.381777
Iter 2/10: ladvise speed: 0.395959
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.324374
Iter 3/10: OSS cache speed: 0.380977
Iter 3/10: ladvise speed: 0.406035
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.355822
Iter 4/10: OSS cache speed: 0.416566
Iter 4/10: ladvise speed: 0.375745
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.371824
Iter 5/10: OSS cache speed: 0.428765
Iter 5/10: ladvise speed: 0.426435
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.375655
Iter 6/10: OSS cache speed: 0.401099
Iter 6/10: ladvise speed: 0.440861
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.364948
Iter 7/10: OSS cache speed: 0.418871
Iter 7/10: ladvise speed: 0.426835
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.342876
Iter 8/10: OSS cache speed: 0.401391
Iter 8/10: ladvise speed: 0.312851
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.374673
Iter 9/10: OSS cache speed: 0.413215
Iter 9/10: ladvise speed: 0.415878
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.353642
Iter 10/10: OSS cache speed: 0.407786
Iter 10/10: ladvise speed: 0.425405
Average uncached read: .35
Average speedup with OSS cached read:  .39 = +11%
Average speedup with ladvise willread:  .40 = +14%
Speedup with OSS cached read less than 20%,  got 11%. Skipping ladvise willread check.
fail_loc=0