== sanity test 255a: check 'lfs ladvise -a willread' ===== 15:59:40 (1787774380)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 12.7457 s, 8.2 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-ffff93eac35c0800.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.35073
Iter 1/10: OSS cache speed: 0.36936
Iter 1/10: ladvise speed: 0.3488
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.293264
Iter 2/10: OSS cache speed: 0.434765
Iter 2/10: ladvise speed: 0.310636
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.352605
Iter 3/10: OSS cache speed: 0.396584
Iter 3/10: ladvise speed: 0.400555
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.305356
Iter 4/10: OSS cache speed: 0.265281
Iter 4/10: ladvise speed: 0.370487
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.298849
Iter 5/10: OSS cache speed: 0.343329
Iter 5/10: ladvise speed: 0.331672
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.393745
Iter 6/10: OSS cache speed: 0.369028
Iter 6/10: ladvise speed: 0.304239
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.316665
Iter 7/10: OSS cache speed: 0.320276
Iter 7/10: ladvise speed: 0.325486
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.353092
Iter 8/10: OSS cache speed: 0.37244
Iter 8/10: ladvise speed: 0.411095
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.312142
Iter 9/10: OSS cache speed: 0.29491
Iter 9/10: ladvise speed: 0.325748
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.329225
Iter 10/10: OSS cache speed: 0.343188
Iter 10/10: ladvise speed: 0.320183
Average uncached read: .33
Average speedup with OSS cached read:  .35 = +6%
Average speedup with ladvise willread:  .34 = +3%
Speedup with OSS cached read less than 20%,  got 6%. Skipping ladvise willread check.
fail_loc=0