Update TesseraCT performance doc with the latest data

Author: roger2hk

docs/assets/gcp/e2-medium-cloud-spanner-100pu/cloud-spanner-total-cpu-utilization.png

@@ -11,15 +11,15 @@ The performance tests were conducted in a controlled environment with determinis
 
 ### GCP
 
-The indicative figures below were measured using the [CT hammer tool](/internal/hammer/) as of [commit `2872ea2`](https://github.com/transparency-dev/tesseract/commit/2872ea2387b2d3077eb832112277eb19a7a907bd). 
+The indicative figures below were measured using the [CT hammer tool](/internal/hammer/) as of [commit `fe7687c`](https://github.com/transparency-dev/tesseract/commit/fe7687c9ed35d11f42a211ee35544ff6c5610ee6). 
 
 The table below shows the measured performance over 12 hours in each instance type:
 
-| Instance Type                    | Cloud Spanner | Write QPS |
-| -------------------------------- | ------------- | --------- |
-| e2-micro (2 vCPUs, 1 GB Memory)  | 100 PUs       | 60        |
-| e2-medium (2 vCPUs, 4 GB Memory) | 100 PUs       | 150       |
-| e2-medium (2 vCPUs, 4 GB Memory) | 200 PUs       | 350       |
+| Instance Type                        | Cloud Spanner | Write QPS |
+| ------------------------------------ | ------------- | --------- |
+| e2-micro (2 vCPUs, 1 GB Memory)      | 100 PUs       | 60        |
+| e2-medium (2 vCPUs, 4 GB Memory)     | 100 PUs       | 250       |
+| e2-standard-2 (2 vCPUs, 8 GB Memory) | 100 PUs       | 600       |
 
 #### Free Tier e2-micro VM Instance + Cloud Spanner 100 PUs
 
@@ -59,27 +59,27 @@ MiB Swap:      0.0 total,      0.0 free,      0.0 used.    156.1 avail Mem
 
 - e2-medium (2 vCPUs, 4 GB Memory)
 
-The write QPS is around 150. The bottleneck is Cloud Spanner CPU. Utilization is always around 100%, most of which is used for deduplication. The VM CPU usage is around 50%.
+The write QPS is around 250. The bottleneck comes from the VM CPU utilization which is always around 100%. The Cloud Spanner CPU utilization is around 20%.
 
 ```
 ┌──────────────────────────────────────────────────────────────────────┐
-│Read (8 workers): Current max: 0/s. Oversupply in last second: 0      │
-│Write (256 workers): Current max: 188/s. Oversupply in last second: 0 │
-│TreeSize: 22722738 (Δ 158qps over 30s)                                │
-│Time-in-queue: 6ms/236ms/1726ms (min/avg/max)                         │
-│Observed-time-to-integrate: 824ms/5290ms/9706ms (min/avg/max)         │
+│Read (0 workers): Current max: 0/s. Oversupply in last second: 0      │
+│Write (512 workers): Current max: 302/s. Oversupply in last second: 0 │
+│TreeSize: 11084877 (Δ 224qps over 30s)                                │
+│Time-in-queue: 48ms/627ms/1717ms (min/avg/max)                        │
+│Observed-time-to-integrate: 1480ms/5401ms/8748ms (min/avg/max)        │
 └──────────────────────────────────────────────────────────────────────┘
 ```
 
 ```
-top - 12:26:28 up 1 day, 14:27,  1 user,  load average: 0.85, 0.73, 0.64
-Tasks:  92 total,   1 running,  91 sleeping,   0 stopped,   0 zombie
-%Cpu(s): 22.7 us,  2.7 sy,  0.0 ni, 71.7 id,  0.0 wa,  0.0 hi,  1.8 si,  1.0 st 
-MiB Mem :   3924.7 total,   2374.0 free,    892.0 used,    895.3 buff/cache     
-MiB Swap:      0.0 total,      0.0 free,      0.0 used.   3032.7 avail Mem 
+top - 19:16:15 up 21:43,  2 users,  load average: 1.60, 1.46, 1.50
+Tasks:  96 total,   2 running,  94 sleeping,   0 stopped,   0 zombie
+%Cpu(s): 86.8 us,  4.0 sy,  0.0 ni,  6.2 id,  0.0 wa,  0.0 hi,  2.2 si,  0.9 st 
+MiB Mem :   3924.7 total,   1204.9 free,   2422.4 used,    519.0 buff/cache     
+MiB Swap:      0.0 total,      0.0 free,      0.0 used.   1502.3 avail Mem 
 
     PID USER      PR  NI    VIRT    RES    SHR S  %CPU  %MEM     TIME+ COMMAND
-   4885 user      20   0 2910800 279060  31420 S  52.2   6.9     18,26 gcp
+  72343 user      20   0 5082652   1.5g  22856 R 182.7  39.5      6,24 gcp     
 ```
 
 <details>
@@ -92,40 +92,40 @@ MiB Swap:      0.0 total,      0.0 free,      0.0 used.   3032.7 avail Mem
 
 </details>
 
-#### e2-medium VM Instance + Cloud Spanner 200 PUs
+#### e2-standard-2 VM Instance + Cloud Spanner 100 PUs
 
-- e2-medium (2 vCPUs, 4 GB Memory)
+- e2-standard-2 (2 vCPUs, 8 GB Memory)
 
-The write QPS is around 350. The bottleneck comes from the VM CPU usage which is always around 90%. The Cloud Spanner CPU utilization is around 50%.
+The write QPS is around 600. The bottleneck comes from the VM CPU utilization which is always around 100%. The Cloud Spanner CPU utilization is around 50%.
 
 ```
 ┌──────────────────────────────────────────────────────────────────────┐
-│Read (8 workers): Current max: 0/s. Oversupply in last second: 0      │
-│Write (350 workers): Current max: 350/s. Oversupply in last second: 0 │
-│TreeSize: 43920322 (Δ 317qps over 30s)                                │
-│Time-in-queue: 35ms/198ms/326ms (min/avg/max)                         │
-│Observed-time-to-integrate: 1024ms/4892ms/6951ms (min/avg/max)        │
+│Read (342 workers): Current max: 0/s. Oversupply in last second: 0    │
+│Write (683 workers): Current max: 655/s. Oversupply in last second: 0 │
+│TreeSize: 14103952 (Δ 583qps over 30s)                                │
+│Time-in-queue: 57ms/506ms/1139ms (min/avg/max)                        │
+│Observed-time-to-integrate: 642ms/4855ms/9637ms (min/avg/max)         │
 └──────────────────────────────────────────────────────────────────────┘
 ```
 
 ```
-top - 12:00:51 up 2 days, 14:02,  1 user,  load average: 1.01, 1.02, 1.17
-Tasks:  93 total,   1 running,  92 sleeping,   0 stopped,   0 zombie
-%Cpu(s): 38.5 us,  5.3 sy,  0.0 ni, 48.6 id,  0.0 wa,  0.0 hi,  1.6 si,  5.9 st 
-MiB Mem :   3924.7 total,   2380.1 free,    935.5 used,    845.7 buff/cache     
-MiB Swap:      0.0 total,      0.0 free,      0.0 used.   2989.2 avail Mem 
+top - 11:12:32 up 58 min,  2 users,  load average: 1.94, 1.94, 1.91
+Tasks:  96 total,   1 running,  95 sleeping,   0 stopped,   0 zombie
+%Cpu(s): 88.0 us,  3.7 sy,  0.0 ni,  5.6 id,  0.0 wa,  0.0 hi,  2.7 si,  0.0 st 
+MiB Mem :   7950.7 total,   4980.7 free,   2029.3 used,   1179.2 buff/cache     
+MiB Swap:      0.0 total,      0.0 free,      0.0 used.   5921.5 avail Mem 
 
     PID USER      PR  NI    VIRT    RES    SHR S  %CPU  %MEM     TIME+ COMMAND
-   4885 user      20   0 2911056 297500  23760 S  97.7   7.4     33,59 gcp 
+   2114 user      20   0 5211120   1.1g  28572 S 186.7  13.6  78:15.01 gcp
 ```
 
 <details>
 
 <summary>Graphs</summary>
 
-![e2-medium VM CPU Utilization](./assets/gcp/e2-medium-cloud-spanner-200pu/vm-cpu-utilization.png)
+![e2-standard-2 VM CPU Utilization](./assets/gcp/e2-standard-2-cloud-spanner-100pu/vm-cpu-utilization.png)
 
-![Cloud Spanner 200 PUs CPU Utilization](./assets/gcp/e2-medium-cloud-spanner-200pu/cloud-spanner-total-cpu-utilization.png)
+![Cloud Spanner 100 PUs CPU Utilization](./assets/gcp/e2-standard-2-cloud-spanner-100pu/cloud-spanner-total-cpu-utilization.png)
 
 </details>