== sanity test 255a: check 'lfs ladvise -a willread' ===== 07:37:31 (1787830651)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 13.397 s, 7.8 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=8
fail_loc=0x237
Asynchronous ladvise shouldn't wait
llite.lustre-ffff8e8758874000.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.349863
Iter 1/10: OSS cache speed: 0.369419
Iter 1/10: ladvise speed: 0.403545
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.321359
Iter 2/10: OSS cache speed: 0.396638
Iter 2/10: ladvise speed: 0.349586
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.375516
Iter 3/10: OSS cache speed: 0.36051
Iter 3/10: ladvise speed: 0.318407
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.309451
Iter 4/10: OSS cache speed: 0.371177
Iter 4/10: ladvise speed: 0.396864
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.326968
Iter 5/10: OSS cache speed: 0.314472
Iter 5/10: ladvise speed: 0.308626
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.303659
Iter 6/10: OSS cache speed: 0.355046
Iter 6/10: ladvise speed: 0.333876
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.336064
Iter 7/10: OSS cache speed: 0.366145
Iter 7/10: ladvise speed: 0.30859
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.251155
Iter 8/10: OSS cache speed: 0.317875
Iter 8/10: ladvise speed: 0.343245
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.287565
Iter 9/10: OSS cache speed: 0.340261
Iter 9/10: ladvise speed: 0.351348
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.248178
Iter 10/10: OSS cache speed: 0.311574
Iter 10/10: ladvise speed: 0.344357
Average uncached read: .31
Average speedup with OSS cached read:  .35 = +12%
Average speedup with ladvise willread:  .34 = +9%
Speedup with OSS cached read less than 20%,  got 12%. Skipping ladvise willread check.
fail_loc=0