== sanity test 255a: check 'lfs ladvise -a willread' ===== 10:41:16 (1787582476)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 12.6505 s, 8.3 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-ffff939f48266000.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.430319
Iter 1/10: OSS cache speed: 0.437788
Iter 1/10: ladvise speed: 0.423074
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.401379
Iter 2/10: OSS cache speed: 0.47529
Iter 2/10: ladvise speed: 0.526495
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.309732
Iter 3/10: OSS cache speed: 0.458004
Iter 3/10: ladvise speed: 0.528978
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.303352
Iter 4/10: OSS cache speed: 0.423384
Iter 4/10: ladvise speed: 0.433383
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.430183
Iter 5/10: OSS cache speed: 0.441216
Iter 5/10: ladvise speed: 0.375578
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.43771
Iter 6/10: OSS cache speed: 0.551367
Iter 6/10: ladvise speed: 0.465188
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.420611
Iter 7/10: OSS cache speed: 0.414392
Iter 7/10: ladvise speed: 0.475633
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.444568
Iter 8/10: OSS cache speed: 0.419831
Iter 8/10: ladvise speed: 0.400439
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.375713
Iter 9/10: OSS cache speed: 0.273494
Iter 9/10: ladvise speed: 0.489886
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.478824
Iter 10/10: OSS cache speed: 0.442488
Iter 10/10: ladvise speed: 0.459994
Average uncached read: .40
Average speedup with OSS cached read:  .43 = +7%
Average speedup with ladvise willread:  .45 = +12%
Speedup with OSS cached read less than 20%,  got 7%. Skipping ladvise willread check.
fail_loc=0