== sanity test 255a: check 'lfs ladvise -a willread' ===== 17:49:28 (1787867368)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 13.8242 s, 7.6 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-ffff91608773a800.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.391513
Iter 1/10: OSS cache speed: 0.432388
Iter 1/10: ladvise speed: 0.560503
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.442974
Iter 2/10: OSS cache speed: 0.453432
Iter 2/10: ladvise speed: 0.439362
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.432247
Iter 3/10: OSS cache speed: 0.442901
Iter 3/10: ladvise speed: 0.562714
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.380757
Iter 4/10: OSS cache speed: 0.462368
Iter 4/10: ladvise speed: 0.505546
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.356446
Iter 5/10: OSS cache speed: 0.371254
Iter 5/10: ladvise speed: 0.483763
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.453213
Iter 6/10: OSS cache speed: 0.450108
Iter 6/10: ladvise speed: 0.423392
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.430754
Iter 7/10: OSS cache speed: 0.425166
Iter 7/10: ladvise speed: 0.475986
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.370094
Iter 8/10: OSS cache speed: 0.439384
Iter 8/10: ladvise speed: 0.457847
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.408173
Iter 9/10: OSS cache speed: 0.447357
Iter 9/10: ladvise speed: 0.463315
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.446223
Iter 10/10: OSS cache speed: 0.485535
Iter 10/10: ladvise speed: 0.479947
Average uncached read: .41
Average speedup with OSS cached read:  .44 = +7%
Average speedup with ladvise willread:  .48 = +17%
Speedup with OSS cached read less than 20%,  got 7%. Skipping ladvise willread check.
fail_loc=0