== sanity test 255a: check 'lfs ladvise -a willread' ===== 19:17:30 (1788563850)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 16.5412 s, 6.3 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-ffff98569858d800.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.303208
Iter 1/10: OSS cache speed: 0.399235
Iter 1/10: ladvise speed: 0.412847
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.442555
Iter 2/10: OSS cache speed: 0.441549
Iter 2/10: ladvise speed: 0.441798
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.446711
Iter 3/10: OSS cache speed: 0.453903
Iter 3/10: ladvise speed: 0.364267
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.272441
Iter 4/10: OSS cache speed: 0.319651
Iter 4/10: ladvise speed: 0.340109
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.359681
Iter 5/10: OSS cache speed: 0.366291
Iter 5/10: ladvise speed: 0.372433
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.474916
Iter 6/10: OSS cache speed: 0.536476
Iter 6/10: ladvise speed: 0.537941
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.49507
Iter 7/10: OSS cache speed: 0.511393
Iter 7/10: ladvise speed: 0.457766
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.479133
Iter 8/10: OSS cache speed: 0.376176
Iter 8/10: ladvise speed: 0.383181
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.296374
Iter 9/10: OSS cache speed: 0.347492
Iter 9/10: ladvise speed: 0.315524
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.314854
Iter 10/10: OSS cache speed: 0.401824
Iter 10/10: ladvise speed: 0.341239
Average uncached read: .38
Average speedup with OSS cached read:  .41 = +7%
Average speedup with ladvise willread:  .39 = +2%
Speedup with OSS cached read less than 20%,  got 7%. Skipping ladvise willread check.
fail_loc=0