== sanity test 255a: check 'lfs ladvise -a willread' ===== 22:48:45 (1764733725)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 13.0367 s, 8.0 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-ffff957443cb8800.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.382611
Iter 1/10: OSS cache speed: 0.389785
Iter 1/10: ladvise speed: 0.32564
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.506703
Iter 2/10: OSS cache speed: 0.559961
Iter 2/10: ladvise speed: 0.483914
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.328271
Iter 3/10: OSS cache speed: 0.475407
Iter 3/10: ladvise speed: 0.498371
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.356545
Iter 4/10: OSS cache speed: 0.455331
Iter 4/10: ladvise speed: 0.670227
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.63347
Iter 5/10: OSS cache speed: 0.71764
Iter 5/10: ladvise speed: 0.85668
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.759457
Iter 6/10: OSS cache speed: 0.924313
Iter 6/10: ladvise speed: 0.832902
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.871291
Iter 7/10: OSS cache speed: 0.935639
Iter 7/10: ladvise speed: 0.923669
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.938645
Iter 8/10: OSS cache speed: 0.931721
Iter 8/10: ladvise speed: 0.577876
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.633173
Iter 9/10: OSS cache speed: 0.691112
Iter 9/10: ladvise speed: 0.705878
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.79691
Iter 10/10: OSS cache speed: 1.10476
Iter 10/10: ladvise speed: 1.01463
Average uncached read: .62
Average speedup with OSS cached read:  .71 = +14%
Average speedup with ladvise willread:  .68 = +9%
Speedup with OSS cached read less than 20%,  got 14%. Skipping ladvise willread check.
fail_loc=0