== sanity test 255a: check 'lfs ladvise -a willread' ===== 00:34:04 (1788582844)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 16.0468 s, 6.5 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-ffff918306709000.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.409879
Iter 1/10: OSS cache speed: 0.393771
Iter 1/10: ladvise speed: 0.393133
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.364666
Iter 2/10: OSS cache speed: 0.350093
Iter 2/10: ladvise speed: 0.32392
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.381278
Iter 3/10: OSS cache speed: 0.358093
Iter 3/10: ladvise speed: 0.36675
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.295919
Iter 4/10: OSS cache speed: 0.325278
Iter 4/10: ladvise speed: 0.352874
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.345017
Iter 5/10: OSS cache speed: 0.354704
Iter 5/10: ladvise speed: 0.38427
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.373098
Iter 6/10: OSS cache speed: 0.425553
Iter 6/10: ladvise speed: 0.42736
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.314563
Iter 7/10: OSS cache speed: 0.323901
Iter 7/10: ladvise speed: 0.321223
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.338666
Iter 8/10: OSS cache speed: 0.372622
Iter 8/10: ladvise speed: 0.342931
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.367214
Iter 9/10: OSS cache speed: 0.389012
Iter 9/10: ladvise speed: 0.286357
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.279958
Iter 10/10: OSS cache speed: 0.369171
Iter 10/10: ladvise speed: 0.30723
Average uncached read: .34
Average speedup with OSS cached read:  .36 = +5%
Average speedup with ladvise willread:  .35 = +2%
Speedup with OSS cached read less than 20%,  got 5%. Skipping ladvise willread check.
fail_loc=0