== sanity test 255a: check 'lfs ladvise -a willread' ===== 07:42:29 (1764938549)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 1.93961 s, 54.1 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: 0.836235
Iter 1/10: OSS cache speed: 0.915253
Iter 1/10: ladvise speed: 0.932399
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.609702
Iter 2/10: OSS cache speed: 0.98521
Iter 2/10: ladvise speed: 0.928953
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.802854
Iter 3/10: OSS cache speed: 0.965773
Iter 3/10: ladvise speed: 1.0036
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.731679
Iter 4/10: OSS cache speed: 1.01908
Iter 4/10: ladvise speed: 0.981971
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.860681
Iter 5/10: OSS cache speed: 1.03716
Iter 5/10: ladvise speed: 0.923018
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.680098
Iter 6/10: OSS cache speed: 0.75099
Iter 6/10: ladvise speed: 0.869321
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.84868
Iter 7/10: OSS cache speed: 0.912086
Iter 7/10: ladvise speed: 0.969589
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.748328
Iter 8/10: OSS cache speed: 1.12869
Iter 8/10: ladvise speed: 1.14283
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 1.00543
Iter 9/10: OSS cache speed: 1.30293
Iter 9/10: ladvise speed: 1.39327
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.982355
Iter 10/10: OSS cache speed: 1.5635
Iter 10/10: ladvise speed: 1.81716
Average uncached read: .81
Average speedup with OSS cached read:  1.05 = +29.62%
Average speedup with ladvise willread:  1.09 = +34.56%
Speedup with OSS cached read less than 20%,  got 1.05%. Skipping ladvise willread check.