== sanity test 255a: check 'lfs ladvise -a willread' ===== 09:53:53 (1786802033)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 10.0632 s, 10.4 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-ffff972c4660b800.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.384899
Iter 1/10: OSS cache speed: 0.50873
Iter 1/10: ladvise speed: 0.537021
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.448209
Iter 2/10: OSS cache speed: 0.492247
Iter 2/10: ladvise speed: 0.454334
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.516562
Iter 3/10: OSS cache speed: 0.552812
Iter 3/10: ladvise speed: 0.525114
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.479631
Iter 4/10: OSS cache speed: 0.507114
Iter 4/10: ladvise speed: 0.501864
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.510702
Iter 5/10: OSS cache speed: 0.444264
Iter 5/10: ladvise speed: 0.533092
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.460034
Iter 6/10: OSS cache speed: 0.536471
Iter 6/10: ladvise speed: 0.532966
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.492887
Iter 7/10: OSS cache speed: 0.43461
Iter 7/10: ladvise speed: 0.365444
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.411878
Iter 8/10: OSS cache speed: 0.437166
Iter 8/10: ladvise speed: 0.457136
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.479875
Iter 9/10: OSS cache speed: 0.458324
Iter 9/10: ladvise speed: 0.460238
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.467941
Iter 10/10: OSS cache speed: 0.544563
Iter 10/10: ladvise speed: 0.492371
Average uncached read: .46
Average speedup with OSS cached read:  .49 = +6%
Average speedup with ladvise willread:  .48 = +4%
Speedup with OSS cached read less than 20%,  got 6%. Skipping ladvise willread check.
fail_loc=0