== sanity test 255a: check 'lfs ladvise -a willread' ===== 12:30:28 (1786465828)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 10.5388 s, 9.9 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-ffff9387ca30e000.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.50646
Iter 1/10: OSS cache speed: 0.477021
Iter 1/10: ladvise speed: 0.525056
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.512109
Iter 2/10: OSS cache speed: 0.506713
Iter 2/10: ladvise speed: 0.496669
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.525096
Iter 3/10: OSS cache speed: 0.52123
Iter 3/10: ladvise speed: 0.550382
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.519411
Iter 4/10: OSS cache speed: 0.474499
Iter 4/10: ladvise speed: 0.516201
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.524182
Iter 5/10: OSS cache speed: 0.502951
Iter 5/10: ladvise speed: 0.578458
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.632237
Iter 6/10: OSS cache speed: 0.641665
Iter 6/10: ladvise speed: 0.655285
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.67907
Iter 7/10: OSS cache speed: 0.663125
Iter 7/10: ladvise speed: 0.762903
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.75857
Iter 8/10: OSS cache speed: 0.777251
Iter 8/10: ladvise speed: 0.838168
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.881849
Iter 9/10: OSS cache speed: 0.917329
Iter 9/10: ladvise speed: 0.881249
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 1.05013
Iter 10/10: OSS cache speed: 1.21526
Iter 10/10: ladvise speed: 1.11112
Average uncached read: .65
Average speedup with OSS cached read:  .66 = +1%
Average speedup with ladvise willread:  .69 = +6%
Speedup with OSS cached read less than 20%,  got 1%. Skipping ladvise willread check.
fail_loc=0