== sanity test 255a: check 'lfs ladvise -a willread' ===== 21:26:44 (1786670804)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 13.1843 s, 8.0 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-ffff914507298000.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.338627
Iter 1/10: OSS cache speed: 0.360978
Iter 1/10: ladvise speed: 0.372677
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.233034
Iter 2/10: OSS cache speed: 0.373627
Iter 2/10: ladvise speed: 0.30825
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.289216
Iter 3/10: OSS cache speed: 0.259506
Iter 3/10: ladvise speed: 0.269836
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.308203
Iter 4/10: OSS cache speed: 0.292101
Iter 4/10: ladvise speed: 0.314568
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.305767
Iter 5/10: OSS cache speed: 0.249535
Iter 5/10: ladvise speed: 0.227856
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.262502
Iter 6/10: OSS cache speed: 0.258247
Iter 6/10: ladvise speed: 0.280725
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.238434
Iter 7/10: OSS cache speed: 0.259554
Iter 7/10: ladvise speed: 0.298455
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.307104
Iter 8/10: OSS cache speed: 0.289746
Iter 8/10: ladvise speed: 0.337919
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.291616
Iter 9/10: OSS cache speed: 0.304631
Iter 9/10: ladvise speed: 0.324849
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.313423
Iter 10/10: OSS cache speed: 0.304318
Iter 10/10: ladvise speed: 0.3129
Average uncached read: .28
Average speedup with OSS cached read:  .29 = +3%
Average speedup with ladvise willread:  .30 = +7%
Speedup with OSS cached read less than 20%,  got 3%. Skipping ladvise willread check.
fail_loc=0