== sanity test 255a: check 'lfs ladvise -a willread' ===== 22:21:33 (1775874093)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 8.18328 s, 12.8 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-ffff8edf10c8f800.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.463703
Iter 1/10: OSS cache speed: 0.498147
Iter 1/10: ladvise speed: 0.636432
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.533167
Iter 2/10: OSS cache speed: 0.597025
Iter 2/10: ladvise speed: 0.660963
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.590572
Iter 3/10: OSS cache speed: 0.645975
Iter 3/10: ladvise speed: 0.765263
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.663707
Iter 4/10: OSS cache speed: 0.789282
Iter 4/10: ladvise speed: 0.816703
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.657489
Iter 5/10: OSS cache speed: 0.746842
Iter 5/10: ladvise speed: 0.803348
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.698824
Iter 6/10: OSS cache speed: 0.805925
Iter 6/10: ladvise speed: 0.872522
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.66731
Iter 7/10: OSS cache speed: 0.998577
Iter 7/10: ladvise speed: 1.09692
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.821164
Iter 8/10: OSS cache speed: 1.14105
Iter 8/10: ladvise speed: 0.918504
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.81986
Iter 9/10: OSS cache speed: 0.928634
Iter 9/10: ladvise speed: 1.14233
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 1.02914
Iter 10/10: OSS cache speed: 1.17255
Iter 10/10: ladvise speed: 1.05262
Average uncached read: .69
Average speedup with OSS cached read:  .83 = +20%
Average speedup with ladvise willread:  .87 = +26%
fail_loc=0