== sanity test 255a: check 'lfs ladvise -a willread' ===== 15:20:40 (1787858440)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 15.0666 s, 7.0 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-ffff898790001000.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.285674
Iter 1/10: OSS cache speed: 0.31892
Iter 1/10: ladvise speed: 0.359721
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.283108
Iter 2/10: OSS cache speed: 0.326049
Iter 2/10: ladvise speed: 0.336049
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.328912
Iter 3/10: OSS cache speed: 0.311001
Iter 3/10: ladvise speed: 0.331916
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.334588
Iter 4/10: OSS cache speed: 0.369837
Iter 4/10: ladvise speed: 0.336135
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.395623
Iter 5/10: OSS cache speed: 0.346346
Iter 5/10: ladvise speed: 0.327198
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.335654
Iter 6/10: OSS cache speed: 0.305517
Iter 6/10: ladvise speed: 0.345975
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.308703
Iter 7/10: OSS cache speed: 0.301463
Iter 7/10: ladvise speed: 0.320108
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.308864
Iter 8/10: OSS cache speed: 0.356355
Iter 8/10: ladvise speed: 0.299533
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.348959
Iter 9/10: OSS cache speed: 0.358414
Iter 9/10: ladvise speed: 0.317484
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.326022
Iter 10/10: OSS cache speed: 0.345446
Iter 10/10: ladvise speed: 0.288944
Average uncached read: .32
Average speedup with OSS cached read:  .33 = +3%
Average speedup with ladvise willread:  .32 = +0%
Speedup with OSS cached read less than 20%,  got 3%. Skipping ladvise willread check.
fail_loc=0