== sanity test 255a: check 'lfs ladvise -a willread' ===== 12:52:51 (1736358771)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.559499 s, 187 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=4
fail_loc=0x237
Asynchronous ladvise shouldn't wait
fail_loc=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 4.99618
Iter 1/10: OSS cache speed: 5.00622
Iter 1/10: ladvise speed: 4.8683
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 4.516
Iter 2/10: OSS cache speed: 4.84218
Iter 2/10: ladvise speed: 4.91167
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 4.38621
Iter 3/10: OSS cache speed: 3.87525
Iter 3/10: ladvise speed: 4.92335
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 4.499
Iter 4/10: OSS cache speed: 4.15825
Iter 4/10: ladvise speed: 4.17983
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 4.71908
Iter 5/10: OSS cache speed: 4.29482
Iter 5/10: ladvise speed: 4.5181
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 4.74077
Iter 6/10: OSS cache speed: 4.45028
Iter 6/10: ladvise speed: 4.52803
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 4.31481
Iter 7/10: OSS cache speed: 3.80499
Iter 7/10: ladvise speed: 3.73068
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 4.15546
Iter 8/10: OSS cache speed: 3.45797
Iter 8/10: ladvise speed: 4.05725
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 3.768
Iter 9/10: OSS cache speed: 4.54036
Iter 9/10: ladvise speed: 3.59919
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 3.81575
Iter 10/10: OSS cache speed: 5.14253
Iter 10/10: ladvise speed: 4.84638
Average uncached read: 4.39
Average speedup with OSS cached read:  4.35 = +-.91%
Average speedup with ladvise willread:  4.41 = +.45%
Speedup with OSS cached read less than 20%,  got 4.35%. Skipping ladvise willread check.