== sanity test 255a: check 'lfs ladvise -a willread' ===== 20:10:11 (1789603811)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 14.0903 s, 7.4 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-ffff8a7dd248d800.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.324572
Iter 1/10: OSS cache speed: 0.400103
Iter 1/10: ladvise speed: 0.445621
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.33954
Iter 2/10: OSS cache speed: 0.390642
Iter 2/10: ladvise speed: 0.405809
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.387439
Iter 3/10: OSS cache speed: 0.430816
Iter 3/10: ladvise speed: 0.411401
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.368352
Iter 4/10: OSS cache speed: 0.428464
Iter 4/10: ladvise speed: 0.417875
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.327857
Iter 5/10: OSS cache speed: 0.417033
Iter 5/10: ladvise speed: 0.374501
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.321644
Iter 6/10: OSS cache speed: 0.412763
Iter 6/10: ladvise speed: 0.429243
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.426431
Iter 7/10: OSS cache speed: 0.427099
Iter 7/10: ladvise speed: 0.375049
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.367785
Iter 8/10: OSS cache speed: 0.373736
Iter 8/10: ladvise speed: 0.454853
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.386801
Iter 9/10: OSS cache speed: 0.451474
Iter 9/10: ladvise speed: 0.342433
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.386332
Iter 10/10: OSS cache speed: 0.438065
Iter 10/10: ladvise speed: 0.417712
Average uncached read: .36
Average speedup with OSS cached read:  .41 = +13%
Average speedup with ladvise willread:  .40 = +11%
Speedup with OSS cached read less than 20%,  got 13%. Skipping ladvise willread check.
fail_loc=0