== sanity test 255a: check 'lfs ladvise -a willread' ===== 05:43:08 (1788514988)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 13.1659 s, 8.0 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-ffff969491ec6000.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.401217
Iter 1/10: OSS cache speed: 0.369566
Iter 1/10: ladvise speed: 0.373532
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.306828
Iter 2/10: OSS cache speed: 0.397181
Iter 2/10: ladvise speed: 0.382768
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.356437
Iter 3/10: OSS cache speed: 0.379564
Iter 3/10: ladvise speed: 0.302934
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.426876
Iter 4/10: OSS cache speed: 0.380023
Iter 4/10: ladvise speed: 0.364999
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.430245
Iter 5/10: OSS cache speed: 0.435007
Iter 5/10: ladvise speed: 0.338296
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.315808
Iter 6/10: OSS cache speed: 0.373052
Iter 6/10: ladvise speed: 0.398617
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.338466
Iter 7/10: OSS cache speed: 0.356669
Iter 7/10: ladvise speed: 0.324918
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.401277
Iter 8/10: OSS cache speed: 0.333789
Iter 8/10: ladvise speed: 0.374659
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.363071
Iter 9/10: OSS cache speed: 0.383123
Iter 9/10: ladvise speed: 0.357498
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.320913
Iter 10/10: OSS cache speed: 0.318949
Iter 10/10: ladvise speed: 0.31327
Average uncached read: .36
Average speedup with OSS cached read:  .37 = +2%
Average speedup with ladvise willread:  .35 = +-2%
Speedup with OSS cached read less than 20%,  got 2%. Skipping ladvise willread check.
fail_loc=0