== sanity test 255a: check 'lfs ladvise -a willread' ===== 05:01:16 (1768557676)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 13.5276 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-ffff918b05663800.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.3541
Iter 1/10: OSS cache speed: 0.351389
Iter 1/10: ladvise speed: 0.376806
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.354837
Iter 2/10: OSS cache speed: 0.389705
Iter 2/10: ladvise speed: 0.460813
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.372071
Iter 3/10: OSS cache speed: 0.456295
Iter 3/10: ladvise speed: 0.43732
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.435029
Iter 4/10: OSS cache speed: 0.48104
Iter 4/10: ladvise speed: 0.365447
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.406241
Iter 5/10: OSS cache speed: 0.406597
Iter 5/10: ladvise speed: 0.443339
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.361358
Iter 6/10: OSS cache speed: 0.425248
Iter 6/10: ladvise speed: 0.394084
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.483194
Iter 7/10: OSS cache speed: 0.407545
Iter 7/10: ladvise speed: 0.504083
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.37172
Iter 8/10: OSS cache speed: 0.421196
Iter 8/10: ladvise speed: 0.398131
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.370422
Iter 9/10: OSS cache speed: 0.407904
Iter 9/10: ladvise speed: 0.443148
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.468135
Iter 10/10: OSS cache speed: 0.339318
Iter 10/10: ladvise speed: 0.432922
Average uncached read: .39
Average speedup with OSS cached read:  .40 = +2%
Average speedup with ladvise willread:  .42 = +7%
Speedup with OSS cached read less than 20%,  got 2%. Skipping ladvise willread check.
fail_loc=0