Frequent slow cold start for Function Next.js Server Handler

Support
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1

Hi! I have a question regarding the Function Next.js Server Handler, we are getting ~2 seconds cold starts from it, what can be the solution to improve that? Thank you

May 21, 11:49:08 AM: f1ea7603 Duration: 8 ms	Memory Usage: 264 MB
May 21, 11:49:08 AM: 71c46a4c Duration: 366 ms	Memory Usage: 264 MB
May 21, 11:49:09 AM: e8673e90 Duration: 8 ms	Memory Usage: 264 MB
May 21, 11:49:09 AM: 7dadc9e0 Duration: 78 ms	Memory Usage: 280 MB
>> May 21, 11:49:12 AM: b36d68d8 Duration: 2214 ms	Memory Usage: 280 MB
May 21, 11:49:16 AM: 6cff19bb Duration: 79 ms	Memory Usage: 280 MB
May 21, 11:49:16 AM: ab2fc437 Duration: 7 ms	Memory Usage: 280 MB
May 21, 11:49:16 AM: a9696e06 Duration: 398 ms	Memory Usage: 280 MB
May 21, 11:49:17 AM: fc790ca1 Duration: 82 ms	Memory Usage: 264 MB
May 21, 11:49:17 AM: 5958ffe6 Duration: 10 ms	Memory Usage: 264 MB
May 21, 11:49:17 AM: f4f17bf9 Duration: 8 ms	Memory Usage: 264 MB
May 21, 11:49:17 AM: 8126d051 Duration: 14 ms	Memory Usage: 264 MB
May 21, 11:49:17 AM: 0888a0b3 Duration: 481 ms	Memory Usage: 264 MB
May 21, 11:49:18 AM: 25b29a9b Duration: 79 ms	Memory Usage: 280 MB
May 21, 11:49:19 AM: 02ea7f6d Duration: 82 ms	Memory Usage: 264 MB
May 21, 11:49:19 AM: f9f2c5f7 Duration: 81 ms	Memory Usage: 264 MB
May 21, 11:49:19 AM: 0e74e4dd Duration: 78 ms	Memory Usage: 280 MB
May 21, 11:49:19 AM: 61d44741 Duration: 11 ms	Memory Usage: 264 MB
May 21, 11:49:20 AM: 9413c0aa Duration: 7 ms	Memory Usage: 280 MB
May 21, 11:51:38 AM: 8abecff6 Duration: 23 ms	Memory Usage: 280 MB
May 21, 11:52:51 AM: f9ed4135 Duration: 418 ms	Memory Usage: 280 MB
May 21, 11:52:54 AM: 3e9070f7 Duration: 80 ms	Memory Usage: 280 MB
May 21, 11:52:54 AM: 1f70685c Duration: 321 ms	Memory Usage: 264 MB
May 21, 11:52:54 AM: fb0949cd Duration: 349 ms	Memory Usage: 321 MB
May 21, 11:53:00 AM: 8ab248c3 Duration: 520 ms	Memory Usage: 321 MB
May 21, 11:53:06 AM: 069f8d3b Duration: 79 ms	Memory Usage: 321 MB
May 21, 11:53:06 AM: cff7bff1 Duration: 81 ms	Memory Usage: 264 MB
May 21, 11:53:09 AM: ce0e69b6 Duration: 86 ms	Memory Usage: 264 MB
May 21, 11:53:10 AM: ff42f46c Duration: 13 ms	Memory Usage: 264 MB
May 21, 11:53:10 AM: 9487c16b Duration: 78 ms	Memory Usage: 321 MB
>> May 21, 11:53:12 AM: 0778cece Duration: 1746 ms	Memory Usage: 265 MB
May 21, 11:53:44 AM: eec732a6 Duration: 83 ms	Memory Usage: 265 MB
May 21, 11:53:45 AM: 135b436c Duration: 80 ms	Memory Usage: 265 MB
May 21, 11:53:47 AM: a7376076 Duration: 242 ms	Memory Usage: 265 MB
May 21, 11:53:47 AM: eba96572 Duration: 23 ms	Memory Usage: 265 MB
May 21, 11:53:48 AM: 754b61a5 Duration: 8 ms	Memory Usage: 265 MB
May 21, 11:53:53 AM: 23bdca2c Duration: 80 ms	Memory Usage: 265 MB
May 21, 11:53:56 AM: bbf18b46 Duration: 357 ms	Memory Usage: 265 MB
May 21, 11:54:00 AM: d7ed67e3 Duration: 241 ms	Memory Usage: 265 MB
May 21, 11:54:03 AM: 39bc9035 Duration: 81 ms	Memory Usage: 265 MB
May 21, 11:54:12 AM: 0fd57939 Duration: 429 ms	Memory Usage: 265 MB
May 21, 11:54:14 AM: 74352d41 Duration: 82 ms	Memory Usage: 265 MB
May 21, 11:54:23 AM: 87e97a4e Duration: 82 ms	Memory Usage: 265 MB
May 21, 11:54:50 AM: 1fe939d8 Duration: 89 ms	Memory Usage: 265 MB
May 21, 11:54:51 AM: 4f267077 Duration: 633 ms	Memory Usage: 265 MB
May 21, 11:54:52 AM: b779c215 Duration: 81 ms	Memory Usage: 265 MB
May 21, 11:54:52 AM: cd832b45 Duration: 8 ms	Memory Usage: 265 MB
May 21, 11:54:54 AM: fabd65df Duration: 24 ms	Memory Usage: 265 MB
May 21, 11:54:54 AM: c78abeb2 Duration: 335 ms	Memory Usage: 321 MB
May 21, 11:54:55 AM: 95b0bc6d Duration: 81 ms	Memory Usage: 321 MB
May 21, 11:54:55 AM: 4782b02a Duration: 81 ms	Memory Usage: 265 MB
May 21, 11:54:55 AM: 2a067f36 Duration: 9 ms	Memory Usage: 321 MB
May 21, 11:54:55 AM: eae0e47a Duration: 7 ms	Memory Usage: 321 MB
May 21, 11:54:55 AM: 866be75b Duration: 8 ms	Memory Usage: 321 MB
May 21, 11:54:56 AM: bbccf50a Duration: 8 ms	Memory Usage: 321 MB
May 21, 11:54:56 AM: 7117e8a9 Duration: 81 ms	Memory Usage: 265 MB
May 21, 11:54:58 AM: a7814dc1 Duration: 813 ms	Memory Usage: 265 MB
May 21, 11:55:05 AM: 8a6aa0ea Duration: 150 ms	Memory Usage: 265 MB
May 21, 11:55:25 AM: adb549b1 Duration: 559 ms	Memory Usage: 265 MB
May 21, 11:55:27 AM: e897b744 Duration: 84 ms	Memory Usage: 265 MB
May 21, 11:55:27 AM: 79c64139 Duration: 8 ms	Memory Usage: 265 MB
May 21, 11:55:29 AM: 6c9c104d Duration: 84 ms	Memory Usage: 265 MB
May 21, 11:55:29 AM: 86ea0e3c Duration: 81 ms	Memory Usage: 321 MB
May 21, 11:55:30 AM: 61adabba Duration: 80 ms	Memory Usage: 321 MB
May 21, 11:55:48 AM: 2ef91c6a Duration: 80 ms	Memory Usage: 321 MB
May 21, 11:56:09 AM: 16b87616 Duration: 81 ms	Memory Usage: 321 MB
>> May 21, 11:56:21 AM: f1586188 Duration: 1644 ms	Memory Usage: 321 MB
>> May 21, 11:56:22 AM: 3889e5e6 Duration: 1100 ms	Memory Usage: 265 MB
May 21, 11:56:37 AM: f86f659e Duration: 396 ms	Memory Usage: 265 MB
May 21, 11:56:41 AM: fd78bdf3 Duration: 440 ms	Memory Usage: 265 MB
May 21, 11:56:43 AM: 77d3cfb3 Duration: 84 ms	Memory Usage: 265 MB
May 21, 11:56:43 AM: ad05b097 Duration: 8 ms	Memory Usage: 265 MB
May 21, 11:56:43 AM: 06e7bf9a Duration: 240 ms	Memory Usage: 265 MB
May 21, 11:56:43 AM: 6646cc56 Duration: 219 ms	Memory Usage: 321 MB
May 21, 11:56:43 AM: 24883e18 Duration: 7 ms	Memory Usage: 265 MB
May 21, 11:56:43 AM: 9c15a3b4 Duration: 25 ms	Memory Usage: 321 MB
May 21, 11:56:44 AM: 513350e6 Duration: 9 ms	Memory Usage: 321 MB
May 21, 11:56:44 AM: e5800ca3 Duration: 80 ms	Memory Usage: 321 MB
May 21, 11:56:44 AM: df131ac9 Duration: 7 ms	Memory Usage: 265 MB
May 21, 11:56:44 AM: 44110d09 Duration: 83 ms	Memory Usage: 265 MB
May 21, 11:56:44 AM: 92f4f9d6 Duration: 314 ms	Memory Usage: 280 MB
May 21, 11:56:44 AM: 31c62ead Duration: 9 ms	Memory Usage: 265 MB
May 21, 11:56:44 AM: 396209b9 Duration: 8 ms	Memory Usage: 265 MB
May 21, 11:56:44 AM: 38594b8f Duration: 8 ms	Memory Usage: 321 MB
May 21, 11:56:45 AM: 9f199277 Duration: 7 ms	Memory Usage: 280 MB
May 21, 11:56:45 AM: eec664cc Duration: 9 ms	Memory Usage: 280 MB
>> May 21, 11:56:45 AM: 8a5e761e Duration: 1074 ms	Memory Usage: 280 MB
May 21, 11:56:45 AM: d7859a29 Duration: 355 ms	Memory Usage: 321 MB
May 21, 11:56:46 AM: 3825123b Duration: 80 ms	Memory Usage: 321 MB
May 21, 11:56:46 AM: b1c03416 Duration: 7 ms	Memory Usage: 265 MB
May 21, 11:57:11 AM: 0db16d67 Duration: 477 ms	Memory Usage: 280 MB
May 21, 11:57:13 AM: dd9841b9 Duration: 79 ms	Memory Usage: 280 MB
May 21, 11:57:13 AM: a1ffceb5 Duration: 94 ms	Memory Usage: 265 MB
May 21, 11:57:13 AM: 4971382a Duration: 7 ms	Memory Usage: 265 MB
May 21, 11:57:13 AM: 0f4194c4 Duration: 7 ms	Memory Usage: 280 MB
May 21, 11:57:13 AM: b2dd7fc7 Duration: 235 ms	Memory Usage: 280 MB
May 21, 11:57:13 AM: 2e1dc810 Duration: 7 ms	Memory Usage: 280 MB
May 21, 11:57:14 AM: 32c186e8 Duration: 25 ms	Memory Usage: 280 MB
May 21, 11:57:14 AM: ed6f7400 Duration: 21 ms	Memory Usage: 280 MB
May 21, 11:57:14 AM: 2f3f8c39 Duration: 17 ms	Memory Usage: 280 MB
May 21, 11:57:14 AM: 69cd66d9 Duration: 80 ms	Memory Usage: 321 MB
May 21, 11:57:14 AM: 523d49a4 Duration: 9 ms	Memory Usage: 265 MB
May 21, 11:57:14 AM: 9984509d Duration: 13 ms	Memory Usage: 321 MB
May 21, 11:57:14 AM: 68679eff Duration: 9 ms	Memory Usage: 321 MB
May 21, 11:57:15 AM: dc389596 Duration: 8 ms	Memory Usage: 321 MB
May 21, 11:57:15 AM: 665b3c32 Duration: 9 ms	Memory Usage: 321 MB
May 21, 11:57:15 AM: 9e07f171 Duration: 7 ms	Memory Usage: 321 MB
May 21, 11:57:15 AM: b2bc6e91 Duration: 8 ms	Memory Usage: 321 MB
May 21, 11:57:15 AM: 3828b6b3 Duration: 83 ms	Memory Usage: 265 MB
May 21, 11:57:15 AM: f3158513 Duration: 83 ms	Memory Usage: 265 MB
May 21, 11:57:15 AM: 55a457d6 Duration: 81 ms	Memory Usage: 321 MB
May 21, 11:57:15 AM: 95e37d50 Duration: 80 ms	Memory Usage: 280 MB
May 21, 11:57:15 AM: 49d5d159 Duration: 324 ms	Memory Usage: 267 MB
May 21, 11:57:16 AM: 45f3f95b Duration: 407 ms	Memory Usage: 267 MB
May 21, 11:57:20 AM: 722da86a Duration: 81 ms	Memory Usage: 267 MB
May 21, 11:57:20 AM: 54f388e1 Duration: 79 ms	Memory Usage: 280 MB
>> May 21, 11:57:30 AM: d29515ec Duration: 2110 ms	Memory Usage: 280 MB
May 21, 11:57:31 AM: 0dd339f4 Duration: 356 ms	Memory Usage: 280 MB
May 21, 11:57:32 AM: dd914fff Duration: 79 ms	Memory Usage: 280 MB
May 21, 11:57:47 AM: 9c2c5b91 Duration: 840 ms	Memory Usage: 321 MB
May 21, 11:57:58 AM: a3b68345 Duration: 82 ms	Memory Usage: 321 MB
...
2

That seems to be 6 out of 121 requests that you’ve shared above. While the other 115 being well-within speeds that can be classified as fast. In any case, these don’t appear to be cold starts. Cold starts have an init duration field as well.

Please check out: [Support Guide] Why is my function taking long or timing out?

1 Like
3

Thank you! I’ll check the link you provided to optimize our calls, but I still have one quetion, you mentioned that cold start include the field init duration, but I have checked my full log and I can’t find any init duration in it, only import next server. Am I suppose to see it in this same log?

4

When a cold start happens you should end up seeing a line like: Log and monitor Python Lambda functions - AWS Lambda. The page is for Python, but also applies to Node.js for this bit. Quoting the line:

Duration: 15.74 ms  Billed Duration: 16 ms Memory Size: 128 MB Max Memory Used: 56 MB  Init Duration: 130.49 ms

Unless something has changed here, this should still hold true.

1 Like