== sanity test 255a: check 'lfs ladvise -a willread' ===== 19:01:48 (1736985708)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.625303 s, 168 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: 3.46396
Iter 1/10: OSS cache speed: 3.28242
Iter 1/10: ladvise speed: 2.97576
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 2.84917
Iter 2/10: OSS cache speed: 3.04749
Iter 2/10: ladvise speed: 3.1671
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 3.658
Iter 3/10: OSS cache speed: 3.16033
Iter 3/10: ladvise speed: 3.67099
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 3.99828
Iter 4/10: OSS cache speed: 4.70134
Iter 4/10: ladvise speed: 4.60509
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 4.78963
Iter 5/10: OSS cache speed: 4.88092
Iter 5/10: ladvise speed: 4.97194
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 4.6586
Iter 6/10: OSS cache speed: 4.83587
Iter 6/10: ladvise speed: 4.63582
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 4.11402
Iter 7/10: OSS cache speed: 4.00376
Iter 7/10: ladvise speed: 4.04814
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 4.88579
Iter 8/10: OSS cache speed: 4.85618
Iter 8/10: ladvise speed: 4.9179
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 4.81648
Iter 9/10: OSS cache speed: 5.0047
Iter 9/10: ladvise speed: 5.32862
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 4.71044
Iter 10/10: OSS cache speed: 4.54572
Iter 10/10: ladvise speed: 4.92067
Average uncached read: 4.19
Average speedup with OSS cached read:  4.23 = +.95%
Average speedup with ladvise willread:  4.32 = +3.10%
Speedup with OSS cached read less than 20%,  got 4.23%. Skipping ladvise willread check.