== sanity test 255a: check 'lfs ladvise -a willread' ===== 19:32:06 (1781047926)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 0.830478 s, 126 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: 3.20171
Iter 1/10: OSS cache speed: 3.04344
Iter 1/10: ladvise speed: 3.71175
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 3.78666
Iter 2/10: OSS cache speed: 3.53536
Iter 2/10: ladvise speed: 3.606
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 3.53226
Iter 3/10: OSS cache speed: 3.94015
Iter 3/10: ladvise speed: 4.10813
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 4.05314
Iter 4/10: OSS cache speed: 4.27493
Iter 4/10: ladvise speed: 4.19509
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 4.50967
Iter 5/10: OSS cache speed: 4.12628
Iter 5/10: ladvise speed: 4.07981
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 4.30776
Iter 6/10: OSS cache speed: 4.3024
Iter 6/10: ladvise speed: 4.41218
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 4.49072
Iter 7/10: OSS cache speed: 4.39144
Iter 7/10: ladvise speed: 4.3368
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 4.6927
Iter 8/10: OSS cache speed: 4.49424
Iter 8/10: ladvise speed: 4.53506
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 4.53159
Iter 9/10: OSS cache speed: 4.71177
Iter 9/10: ladvise speed: 4.62396
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 4.61033
Iter 10/10: OSS cache speed: 4.59249
Iter 10/10: ladvise speed: 4.69316
Average uncached read: 4.17
Average speedup with OSS cached read:  4.14 = +-.71%
Average speedup with ladvise willread:  4.23 = +1.43%
Speedup with OSS cached read less than 20%,  got 4.14%. Skipping ladvise willread check.