== sanity test 255a: check 'lfs ladvise -a willread' ===== 08:17:03 (1721218623)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.576494 s, 182 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: 2.91373
Iter 1/10: OSS cache speed: 2.87231
Iter 1/10: ladvise speed: 2.78328
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 3.46624
Iter 2/10: OSS cache speed: 2.79003
Iter 2/10: ladvise speed: 2.78835
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 2.70984
Iter 3/10: OSS cache speed: 2.70385
Iter 3/10: ladvise speed: 2.72441
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 2.73984
Iter 4/10: OSS cache speed: 2.90322
Iter 4/10: ladvise speed: 2.79151
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 2.73787
Iter 5/10: OSS cache speed: 2.81189
Iter 5/10: ladvise speed: 2.7405
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 2.50162
Iter 6/10: OSS cache speed: 2.76513
Iter 6/10: ladvise speed: 2.73277
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 2.48444
Iter 7/10: OSS cache speed: 2.57464
Iter 7/10: ladvise speed: 2.54343
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 2.53535
Iter 8/10: OSS cache speed: 2.5208
Iter 8/10: ladvise speed: 2.57156
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 2.4884
Iter 9/10: OSS cache speed: 2.50254
Iter 9/10: ladvise speed: 2.54812
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 2.51048
Iter 10/10: OSS cache speed: 2.49071
Iter 10/10: ladvise speed: 2.50249
Average uncached read: 2.70
Average speedup with OSS cached read:  2.69 = +-.37%
Average speedup with ladvise willread:  2.67 = +-1.11%
Speedup with OSS cached read less than 20%,  got 2.69%. Skipping ladvise willread check.