== sanity test 255a: check 'lfs ladvise -a willread' ===== 11:36:20 (1737131780)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.727524 s, 144 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: 5.88227
Iter 1/10: OSS cache speed: 7.57819
Iter 1/10: ladvise speed: 6.47532
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 5.61685
Iter 2/10: OSS cache speed: 6.91371
Iter 2/10: ladvise speed: 7.9182
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 6.6629
Iter 3/10: OSS cache speed: 6.48511
Iter 3/10: ladvise speed: 6.48935
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 5.68005
Iter 4/10: OSS cache speed: 6.52198
Iter 4/10: ladvise speed: 6.5798
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 5.75706
Iter 5/10: OSS cache speed: 6.42267
Iter 5/10: ladvise speed: 6.43667
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 5.82342
Iter 6/10: OSS cache speed: 6.60257
Iter 6/10: ladvise speed: 6.54428
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 5.49093
Iter 7/10: OSS cache speed: 6.70024
Iter 7/10: ladvise speed: 6.71604
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 5.5338
Iter 8/10: OSS cache speed: 6.58364
Iter 8/10: ladvise speed: 6.59274
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 5.73234
Iter 9/10: OSS cache speed: 6.5933
Iter 9/10: ladvise speed: 6.46849
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 5.57367
Iter 10/10: OSS cache speed: 6.35784
Iter 10/10: ladvise speed: 6.60264
Average uncached read: 5.77
Average speedup with OSS cached read:  6.67 = +15.59%
Average speedup with ladvise willread:  6.68 = +15.77%
Speedup with OSS cached read less than 20%,  got 6.67%. Skipping ladvise willread check.