== sanity test 255a: check 'lfs ladvise -a willread' ===== 17:26:24 (1747257984)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.563375 s, 186 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: 4.89617
Iter 1/10: OSS cache speed: 4.87152
Iter 1/10: ladvise speed: 2.65474
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 3.53205
Iter 2/10: OSS cache speed: 4.25149
Iter 2/10: ladvise speed: 3.84012
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 3.37599
Iter 3/10: OSS cache speed: 3.77219
Iter 3/10: ladvise speed: 3.81197
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 3.15357
Iter 4/10: OSS cache speed: 3.4881
Iter 4/10: ladvise speed: 3.25234
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 3.21374
Iter 5/10: OSS cache speed: 3.89591
Iter 5/10: ladvise speed: 3.85565
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 3.05263
Iter 6/10: OSS cache speed: 4.22283
Iter 6/10: ladvise speed: 3.97379
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 3.59563
Iter 7/10: OSS cache speed: 3.66617
Iter 7/10: ladvise speed: 3.5949
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 3.63701
Iter 8/10: OSS cache speed: 3.63806
Iter 8/10: ladvise speed: 2.54761
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 3.05535
Iter 9/10: OSS cache speed: 3.41814
Iter 9/10: ladvise speed: 2.80519
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 3.30513
Iter 10/10: OSS cache speed: 3.71397
Iter 10/10: ladvise speed: 3.37501
Average uncached read: 3.48
Average speedup with OSS cached read:  3.89 = +11.78%
Average speedup with ladvise willread:  3.37 = +-3.16%
Speedup with OSS cached read less than 20%,  got 3.89%. Skipping ladvise willread check.