== sanity test 255a: check 'lfs ladvise -a willread' ===== 23:30:27 (1789183827)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 16.0343 s, 6.5 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-ffff916011061000.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.367942
Iter 1/10: OSS cache speed: 0.40251
Iter 1/10: ladvise speed: 0.34202
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.352676
Iter 2/10: OSS cache speed: 0.390339
Iter 2/10: ladvise speed: 0.372507
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.338624
Iter 3/10: OSS cache speed: 0.385977
Iter 3/10: ladvise speed: 0.419402
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.371514
Iter 4/10: OSS cache speed: 0.426925
Iter 4/10: ladvise speed: 0.372273
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.308536
Iter 5/10: OSS cache speed: 0.394304
Iter 5/10: ladvise speed: 0.382341
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.430601
Iter 6/10: OSS cache speed: 0.453067
Iter 6/10: ladvise speed: 0.387029
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.461422
Iter 7/10: OSS cache speed: 0.387609
Iter 7/10: ladvise speed: 0.269381
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.333835
Iter 8/10: OSS cache speed: 0.368731
Iter 8/10: ladvise speed: 0.339341
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.387835
Iter 9/10: OSS cache speed: 0.389593
Iter 9/10: ladvise speed: 0.371502
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.327092
Iter 10/10: OSS cache speed: 0.374951
Iter 10/10: ladvise speed: 0.340061
Average uncached read: .36
Average speedup with OSS cached read:  .39 = +8%
Average speedup with ladvise willread:  .35 = +-2%
Speedup with OSS cached read less than 20%,  got 8%. Skipping ladvise willread check.
fail_loc=0