== sanity test 255a: check 'lfs ladvise -a willread' ===== 10:51:40 (1787583100)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 11.8946 s, 8.8 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-ffff950506368800.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.303993
Iter 1/10: OSS cache speed: 0.339314
Iter 1/10: ladvise speed: 0.298359
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.26955
Iter 2/10: OSS cache speed: 0.340477
Iter 2/10: ladvise speed: 0.376588
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.338831
Iter 3/10: OSS cache speed: 0.37018
Iter 3/10: ladvise speed: 0.374818
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.348457
Iter 4/10: OSS cache speed: 0.37361
Iter 4/10: ladvise speed: 0.388424
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.307623
Iter 5/10: OSS cache speed: 0.386806
Iter 5/10: ladvise speed: 0.345353
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.332704
Iter 6/10: OSS cache speed: 0.364761
Iter 6/10: ladvise speed: 0.321067
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.30997
Iter 7/10: OSS cache speed: 0.318436
Iter 7/10: ladvise speed: 0.294689
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.297897
Iter 8/10: OSS cache speed: 0.35881
Iter 8/10: ladvise speed: 0.367082
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.355505
Iter 9/10: OSS cache speed: 0.371879
Iter 9/10: ladvise speed: 0.355089
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.31921
Iter 10/10: OSS cache speed: 0.356641
Iter 10/10: ladvise speed: 0.347445
Average uncached read: .31
Average speedup with OSS cached read:  .35 = +12%
Average speedup with ladvise willread:  .34 = +9%
Speedup with OSS cached read less than 20%,  got 12%. Skipping ladvise willread check.
fail_loc=0