== sanity test 255a: check 'lfs ladvise -a willread' ===== 00:37:47 (1786077467)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 15.6866 s, 6.7 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-ffff8f7e8af1a800.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.351396
Iter 1/10: OSS cache speed: 0.324219
Iter 1/10: ladvise speed: 0.332802
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.325131
Iter 2/10: OSS cache speed: 0.331601
Iter 2/10: ladvise speed: 0.317546
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.376435
Iter 3/10: OSS cache speed: 0.407294
Iter 3/10: ladvise speed: 0.351348
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.383773
Iter 4/10: OSS cache speed: 0.375332
Iter 4/10: ladvise speed: 0.414089
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.429629
Iter 5/10: OSS cache speed: 0.461212
Iter 5/10: ladvise speed: 0.394768
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.396713
Iter 6/10: OSS cache speed: 0.415621
Iter 6/10: ladvise speed: 0.365485
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.356505
Iter 7/10: OSS cache speed: 0.37193
Iter 7/10: ladvise speed: 0.314013
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.340732
Iter 8/10: OSS cache speed: 0.360782
Iter 8/10: ladvise speed: 0.360577
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.396102
Iter 9/10: OSS cache speed: 0.410825
Iter 9/10: ladvise speed: 0.352514
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.374989
Iter 10/10: OSS cache speed: 0.383001
Iter 10/10: ladvise speed: 0.387827
Average uncached read: .37
Average speedup with OSS cached read:  .38 = +2%
Average speedup with ladvise willread:  .35 = +-5%
Speedup with OSS cached read less than 20%,  got 2%. Skipping ladvise willread check.
fail_loc=0