== sanity test 255a: check 'lfs ladvise -a willread' ===== 18:19:27 (1746137967)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 2.88708 s, 36.3 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-ffff88013737f000.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 1.0194
Iter 1/10: OSS cache speed: 0.967484
Iter 1/10: ladvise speed: 0.988507
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 1.07629
Iter 2/10: OSS cache speed: 0.975984
Iter 2/10: ladvise speed: 0.946301
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 1.05868
Iter 3/10: OSS cache speed: 0.914065
Iter 3/10: ladvise speed: 0.849306
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.940572
Iter 4/10: OSS cache speed: 0.795382
Iter 4/10: ladvise speed: 0.829435
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.791264
Iter 5/10: OSS cache speed: 0.733573
Iter 5/10: ladvise speed: 0.711525
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.741626
Iter 6/10: OSS cache speed: 0.877781
Iter 6/10: ladvise speed: 0.776464
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.819713
Iter 7/10: OSS cache speed: 0.765744
Iter 7/10: ladvise speed: 0.7683
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.67737
Iter 8/10: OSS cache speed: 0.802902
Iter 8/10: ladvise speed: 0.759063
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.743328
Iter 9/10: OSS cache speed: 0.697516
Iter 9/10: ladvise speed: 0.785083
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.818843
Iter 10/10: OSS cache speed: 0.691476
Iter 10/10: ladvise speed: 0.675417
Average uncached read: .86
Average speedup with OSS cached read:  .82 = +-4%
Average speedup with ladvise willread:  .80 = +-6%
Speedup with OSS cached read less than 20%,  got -4%. Skipping ladvise willread check.
fail_loc=0