== sanity test 255a: check 'lfs ladvise -a willread' ===== 17:53:12 (1787435592)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 13.4451 s, 7.8 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-ffff970ad3e95000.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.363893
Iter 1/10: OSS cache speed: 0.355183
Iter 1/10: ladvise speed: 0.330358
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.318521
Iter 2/10: OSS cache speed: 0.338981
Iter 2/10: ladvise speed: 0.305876
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.359452
Iter 3/10: OSS cache speed: 0.357688
Iter 3/10: ladvise speed: 0.346245
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.390815
Iter 4/10: OSS cache speed: 0.422069
Iter 4/10: ladvise speed: 0.418282
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.302115
Iter 5/10: OSS cache speed: 0.32183
Iter 5/10: ladvise speed: 0.403489
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.404419
Iter 6/10: OSS cache speed: 0.437795
Iter 6/10: ladvise speed: 0.34086
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.328813
Iter 7/10: OSS cache speed: 0.391942
Iter 7/10: ladvise speed: 0.353985
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.330465
Iter 8/10: OSS cache speed: 0.41132
Iter 8/10: ladvise speed: 0.350899
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.317933
Iter 9/10: OSS cache speed: 0.358364
Iter 9/10: ladvise speed: 0.30931
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.370886
Iter 10/10: OSS cache speed: 0.412723
Iter 10/10: ladvise speed: 0.406805
Average uncached read: .34
Average speedup with OSS cached read:  .38 = +11%
Average speedup with ladvise willread:  .35 = +2%
Speedup with OSS cached read less than 20%,  got 11%. Skipping ladvise willread check.
fail_loc=0