== sanity test 255a: check 'lfs ladvise -a willread' ===== 14:42:08 (1789065728)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 14.4222 s, 7.3 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-ffff8b5dd85f8800.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.39858
Iter 1/10: OSS cache speed: 0.374451
Iter 1/10: ladvise speed: 0.415481
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.439883
Iter 2/10: OSS cache speed: 0.42957
Iter 2/10: ladvise speed: 0.48515
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.394401
Iter 3/10: OSS cache speed: 0.423957
Iter 3/10: ladvise speed: 0.43555
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.332029
Iter 4/10: OSS cache speed: 0.426861
Iter 4/10: ladvise speed: 0.484835
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.359711
Iter 5/10: OSS cache speed: 0.419459
Iter 5/10: ladvise speed: 0.487049
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.398751
Iter 6/10: OSS cache speed: 0.511311
Iter 6/10: ladvise speed: 0.449824
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.438285
Iter 7/10: OSS cache speed: 0.499677
Iter 7/10: ladvise speed: 0.514465
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.395392
Iter 8/10: OSS cache speed: 0.433828
Iter 8/10: ladvise speed: 0.537797
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.46203
Iter 9/10: OSS cache speed: 0.520403
Iter 9/10: ladvise speed: 0.579886
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.503388
Iter 10/10: OSS cache speed: 0.55819
Iter 10/10: ladvise speed: 0.538875
Average uncached read: .41
Average speedup with OSS cached read:  .45 = +9%
Average speedup with ladvise willread:  .49 = +19%
Speedup with OSS cached read less than 20%,  got 9%. Skipping ladvise willread check.
fail_loc=0