== sanity test 255a: check 'lfs ladvise -a willread' ===== 03:00:07 (1786950007)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 15.6581 s, 6.7 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-ffff9557c7b31000.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.340104
Iter 1/10: OSS cache speed: 0.36108
Iter 1/10: ladvise speed: 0.285976
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.284787
Iter 2/10: OSS cache speed: 0.310465
Iter 2/10: ladvise speed: 0.287123
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.339631
Iter 3/10: OSS cache speed: 0.334147
Iter 3/10: ladvise speed: 0.325968
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.331791
Iter 4/10: OSS cache speed: 0.309653
Iter 4/10: ladvise speed: 0.33752
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.27868
Iter 5/10: OSS cache speed: 0.297488
Iter 5/10: ladvise speed: 0.354597
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.335384
Iter 6/10: OSS cache speed: 0.359739
Iter 6/10: ladvise speed: 0.348693
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.353906
Iter 7/10: OSS cache speed: 0.299333
Iter 7/10: ladvise speed: 0.349305
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.343253
Iter 8/10: OSS cache speed: 0.40239
Iter 8/10: ladvise speed: 0.395271
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.35819
Iter 9/10: OSS cache speed: 0.304467
Iter 9/10: ladvise speed: 0.374275
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.331377
Iter 10/10: OSS cache speed: 0.37156
Iter 10/10: ladvise speed: 0.371941
Average uncached read: .32
Average speedup with OSS cached read:  .33 = +3%
Average speedup with ladvise willread:  .34 = +6%
Speedup with OSS cached read less than 20%,  got 3%. Skipping ladvise willread check.
fail_loc=0