== sanity test 255a: check 'lfs ladvise -a willread' ===== 15:20:27 (1786735227)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 12.058 s, 8.7 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-ffff92495979d800.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.32096
Iter 1/10: OSS cache speed: 0.33284
Iter 1/10: ladvise speed: 0.33556
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.354223
Iter 2/10: OSS cache speed: 0.291267
Iter 2/10: ladvise speed: 0.307151
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.27527
Iter 3/10: OSS cache speed: 0.256723
Iter 3/10: ladvise speed: 0.320391
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.316941
Iter 4/10: OSS cache speed: 0.304377
Iter 4/10: ladvise speed: 0.280603
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.319421
Iter 5/10: OSS cache speed: 0.325766
Iter 5/10: ladvise speed: 0.345839
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.288877
Iter 6/10: OSS cache speed: 0.298607
Iter 6/10: ladvise speed: 0.306152
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.342631
Iter 7/10: OSS cache speed: 0.28969
Iter 7/10: ladvise speed: 0.304619
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.356347
Iter 8/10: OSS cache speed: 0.344564
Iter 8/10: ladvise speed: 0.351768
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.319746
Iter 9/10: OSS cache speed: 0.314828
Iter 9/10: ladvise speed: 0.277347
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.313329
Iter 10/10: OSS cache speed: 0.328479
Iter 10/10: ladvise speed: 0.324673
Average uncached read: .32
Average speedup with OSS cached read:  .30 = +-6%
Average speedup with ladvise willread:  .31 = +-3%
Speedup with OSS cached read less than 20%,  got -6%. Skipping ladvise willread check.
fail_loc=0