== sanity test 255a: check 'lfs ladvise -a willread' ===== 20:39:22 (1736991562)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.581507 s, 180 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: 3.94484
Iter 1/10: OSS cache speed: 5.85994
Iter 1/10: ladvise speed: 5.58622
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 5.55858
Iter 2/10: OSS cache speed: 5.88733
Iter 2/10: ladvise speed: 6.86575
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 5.83344
Iter 3/10: OSS cache speed: 6.70242
Iter 3/10: ladvise speed: 6.95658
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 5.92398
Iter 4/10: OSS cache speed: 6.54184
Iter 4/10: ladvise speed: 6.80022
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 5.72241
Iter 5/10: OSS cache speed: 6.73755
Iter 5/10: ladvise speed: 6.89536
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 6.02385
Iter 6/10: OSS cache speed: 6.44569
Iter 6/10: ladvise speed: 6.17481
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 5.77508
Iter 7/10: OSS cache speed: 6.51086
Iter 7/10: ladvise speed: 6.0392
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 5.15431
Iter 8/10: OSS cache speed: 5.40501
Iter 8/10: ladvise speed: 6.77964
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 5.6571
Iter 9/10: OSS cache speed: 6.8062
Iter 9/10: ladvise speed: 6.77171
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 5.39438
Iter 10/10: OSS cache speed: 6.42996
Iter 10/10: ladvise speed: 6.89964
Average uncached read: 5.49
Average speedup with OSS cached read:  6.33 = +15.30%
Average speedup with ladvise willread:  6.57 = +19.67%
Speedup with OSS cached read less than 20%,  got 6.33%. Skipping ladvise willread check.