== sanity test 255a: check 'lfs ladvise -a willread' ===== 15:17:15 (1787858235)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 12.7455 s, 8.2 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-ffff945752f66800.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.426069
Iter 1/10: OSS cache speed: 0.450456
Iter 1/10: ladvise speed: 0.353249
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.343749
Iter 2/10: OSS cache speed: 0.413919
Iter 2/10: ladvise speed: 0.453613
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.384483
Iter 3/10: OSS cache speed: 0.390805
Iter 3/10: ladvise speed: 0.452111
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.350631
Iter 4/10: OSS cache speed: 0.434
Iter 4/10: ladvise speed: 0.440766
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.405354
Iter 5/10: OSS cache speed: 0.365661
Iter 5/10: ladvise speed: 0.338596
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.36207
Iter 6/10: OSS cache speed: 0.337867
Iter 6/10: ladvise speed: 0.357372
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.279579
Iter 7/10: OSS cache speed: 0.307956
Iter 7/10: ladvise speed: 0.399304
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.332399
Iter 8/10: OSS cache speed: 0.395873
Iter 8/10: ladvise speed: 0.384293
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.355668
Iter 9/10: OSS cache speed: 0.418241
Iter 9/10: ladvise speed: 0.430733
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.39233
Iter 10/10: OSS cache speed: 0.421985
Iter 10/10: ladvise speed: 0.455313
Average uncached read: .36
Average speedup with OSS cached read:  .39 = +8%
Average speedup with ladvise willread:  .40 = +11%
Speedup with OSS cached read less than 20%,  got 8%. Skipping ladvise willread check.
fail_loc=0