== sanity test 255a: check 'lfs ladvise -a willread' ===== 22:52:29 (1787367149)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 15.4427 s, 6.8 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-ffff963d112ea000.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.301858
Iter 1/10: OSS cache speed: 0.373395
Iter 1/10: ladvise speed: 0.373974
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.331348
Iter 2/10: OSS cache speed: 0.378931
Iter 2/10: ladvise speed: 0.36718
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.344165
Iter 3/10: OSS cache speed: 0.33849
Iter 3/10: ladvise speed: 0.429113
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.309738
Iter 4/10: OSS cache speed: 0.385802
Iter 4/10: ladvise speed: 0.365251
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.330674
Iter 5/10: OSS cache speed: 0.400107
Iter 5/10: ladvise speed: 0.389562
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.342967
Iter 6/10: OSS cache speed: 0.393463
Iter 6/10: ladvise speed: 0.412609
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.340094
Iter 7/10: OSS cache speed: 0.362586
Iter 7/10: ladvise speed: 0.349276
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.292012
Iter 8/10: OSS cache speed: 0.407223
Iter 8/10: ladvise speed: 0.349606
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.378326
Iter 9/10: OSS cache speed: 0.389448
Iter 9/10: ladvise speed: 0.392144
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.364713
Iter 10/10: OSS cache speed: 0.393083
Iter 10/10: ladvise speed: 0.356394
Average uncached read: .33
Average speedup with OSS cached read:  .38 = +15%
Average speedup with ladvise willread:  .37 = +12%
Speedup with OSS cached read less than 20%,  got 15%. Skipping ladvise willread check.
fail_loc=0