== sanity test 255a: check 'lfs ladvise -a willread' ===== 03:35:35 (1780385735)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 14.5302 s, 7.2 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-ffff962647dee800.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.431461
Iter 1/10: OSS cache speed: 0.511129
Iter 1/10: ladvise speed: 0.531475
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.490766
Iter 2/10: OSS cache speed: 0.491636
Iter 2/10: ladvise speed: 0.533806
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.49045
Iter 3/10: OSS cache speed: 0.552396
Iter 3/10: ladvise speed: 0.579216
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.581013
Iter 4/10: OSS cache speed: 0.699813
Iter 4/10: ladvise speed: 0.69348
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.60276
Iter 5/10: OSS cache speed: 0.684104
Iter 5/10: ladvise speed: 0.685175
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.663152
Iter 6/10: OSS cache speed: 0.836257
Iter 6/10: ladvise speed: 1.01486
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.850304
Iter 7/10: OSS cache speed: 1.26252
Iter 7/10: ladvise speed: 1.17508
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 1.04868
Iter 8/10: OSS cache speed: 1.18602
Iter 8/10: ladvise speed: 0.974368
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 1.08989
Iter 9/10: OSS cache speed: 1.44565
Iter 9/10: ladvise speed: 1.74625
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 1.65799
Iter 10/10: OSS cache speed: 2.04687
Iter 10/10: ladvise speed: 1.92727
Average uncached read: .79
Average speedup with OSS cached read:  .97 = +22%
Average speedup with ladvise willread:  .98 = +24%
fail_loc=0