== sanity test 255a: check 'lfs ladvise -a willread' ===== 00:09:45 (1746072585)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 4.23166 s, 24.8 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-ffff8800b6d2a000.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 1.07243
Iter 1/10: OSS cache speed: 1.13766
Iter 1/10: ladvise speed: 0.95402
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.723148
Iter 2/10: OSS cache speed: 0.892085
Iter 2/10: ladvise speed: 0.8785
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.872802
Iter 3/10: OSS cache speed: 0.904319
Iter 3/10: ladvise speed: 0.829355
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.617928
Iter 4/10: OSS cache speed: 0.755654
Iter 4/10: ladvise speed: 0.947266
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.678477
Iter 5/10: OSS cache speed: 0.912159
Iter 5/10: ladvise speed: 0.742052
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.766327
Iter 6/10: OSS cache speed: 0.893812
Iter 6/10: ladvise speed: 0.935088
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.923489
Iter 7/10: OSS cache speed: 1.13063
Iter 7/10: ladvise speed: 1.08561
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.970786
Iter 8/10: OSS cache speed: 1.0555
Iter 8/10: ladvise speed: 1.16356
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.791905
Iter 9/10: OSS cache speed: 1.05488
Iter 9/10: ladvise speed: 1.19698
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.985558
Iter 10/10: OSS cache speed: 1.18471
Iter 10/10: ladvise speed: 1.56042
Average uncached read: .84
Average speedup with OSS cached read:  .99 = +17%
Average speedup with ladvise willread:  1.02 = +21%
Speedup with OSS cached read less than 20%,  got 17%. Skipping ladvise willread check.
fail_loc=0