If started with Vegas miner does not create cached compiled kernels.
Each start it compiles kernels again. Only zero-sized file with name '687F' is created.
Start of the log looks like this.
GPU0: 687F:C3 [gfx901] [8176 MB][Intensity 110.0][W: 8][T: 2][K: 1][BUS: 19]
GPU1: 687F:C1 [gfx901] [8176 MB][Intensity 110.0][W: 8][T: 2][K: 1][BUS: 3]
GPU2: 687F:C1 [gfx901] [8176 MB][Intensity 110.0][W: 8][T: 2][K: 1][BUS: 10]
GPU3: 687F:C3 [gfx901] [8176 MB][Intensity 110.0][W: 8][T: 2][K: 1][BUS: 7]
GPU4: 687F:C1 [gfx901] [8176 MB][Intensity 110.0][W: 8][T: 2][K: 1][BUS: 16]
GPU5: 687F:C1 [gfx901] [8176 MB][Intensity 110.0][W: 8][T: 2][K: 1][BUS: 13]
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SRBMiner Cryptonight AMD GPU miner 1.5.3
DevFee 1 minute every 2 hours (~ 0.85%)
Press 's' to get some stats
Press 'h' to get some hashrate
Give it a few minutes to reach maximum hashrate
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Total pools: 1
Please wait...
Cryptonight ArtoCash mode enabled
[2018-05-13 16:14:07] Heating up system, please wait...
[2018-05-13 16:14:07] Compiling kernel for DEVICE BUS ID 19 ...
[2018-05-13 16:14:21] Compiling kernel for DEVICE BUS ID 19 ...