== sanity test 255a: check 'lfs ladvise -a willread' ===== 14:38:30 (1777574310)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 7.05717 s, 14.9 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-ffff998c84a1a000.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.553389
Iter 1/10: OSS cache speed: 0.73854
Iter 1/10: ladvise speed: 0.729297
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.655902
Iter 2/10: OSS cache speed: 0.868123
Iter 2/10: ladvise speed: 0.679261
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.435951
Iter 3/10: OSS cache speed: 0.587178
Iter 3/10: ladvise speed: 0.389496
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.288356
Iter 4/10: OSS cache speed: 0.376933
Iter 4/10: ladvise speed: 0.287214
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.270094
Iter 5/10: OSS cache speed: 0.347634
Iter 5/10: ladvise speed: 0.319985
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.303732
Iter 6/10: OSS cache speed: 0.302448
Iter 6/10: ladvise speed: 0.308635
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.28573
Iter 7/10: OSS cache speed: 0.338596
Iter 7/10: ladvise speed: 0.309288
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.30452
Iter 8/10: OSS cache speed: 0.306814
Iter 8/10: ladvise speed: 0.339166
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.318199
Iter 9/10: OSS cache speed: 0.384098
Iter 9/10: ladvise speed: 0.386809
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.344166
Iter 10/10: OSS cache speed: 0.325476
Iter 10/10: ladvise speed: 0.337676
Average uncached read: .37
Average speedup with OSS cached read:  .45 = +21%
Average speedup with ladvise willread:  .40 = +8%
fail_loc=0