I've modified a Github project to test for some more Entity Framework related ways of doing queries.
Link
Models:
[Table("Player")]
public partial class Player
{
public int Id { get; set; }
[Required]
[StringLength(200)]
public string FirstName { get; set; }
[Required]
[StringLength(200)]
public string LastName { get; set; }
public DateTime DateOfBirth { get; set; }
public int TeamId { get; set; }
public virtual Team Team { get; set; }
}
[Table("Team")]
public partial class Team
{
public Team()
{
Players = new HashSet<Player>();
}
public int Id { get; set; }
[Required]
[StringLength(200)]
public string Name { get; set; }
public DateTime FoundingDate { get; set; }
public int SportId { get; set; }
public virtual ICollection<Player> Players { get; set; }
public virtual Sport Sport { get; set; }
}
[Table("Sport")]
public partial class Sport
{
public Sport()
{
Teams = new HashSet<Team>();
}
public int Id { get; set; }
[StringLength(100)]
public string Name { get; set; }
public virtual ICollection<Team> Teams { get; set; }
}
What i am testing for is these things:
EF "Sync" - FirstOrDefault() and ToList()
context.Players.FirstOrDefault(x => x.Id == id);
context.Players.AsNoTracking().Where(x => x.TeamId == teamId).ToList();
context.Teams.AsNoTracking().Include(x => x.Players).Where(x => x.SportId == sportId).ToList();
EF "Async" - FirstOrDefaultAsync() and ToListAsync()
await context.Players.FirstOrDefaultAsync(x => x.Id == id);
await context.Players.AsNoTracking().Where(x => x.TeamId == teamId).ToListAsync();
await context.Teams.AsNoTracking().Include(x => x.Players).Where(x => x.SportId == sportId).ToListAsync();
EF "Sync" with Select into DTO objects
context.Players.Select(p => new PlayerDTO()
{
Id = p.Id,
FirstName = p.FirstName,
DateOfBirth = p.DateOfBirth,
LastName = p.LastName,
TeamId = p.TeamId
}).FirstOrDefault(x => x.Id == id);
context.Players.Where(x => x.TeamId == teamId).Select(p => new PlayerDTO()
{
Id = p.Id,
FirstName = p.FirstName,
DateOfBirth = p.DateOfBirth,
LastName = p.LastName,
TeamId = p.TeamId
}).ToList();
context.Teams.Where(x => x.SportId == sportId).Select(t => new TeamDTO()
{
Id = t.Id,
FoundingDate = t.FoundingDate,
Name = t.Name,
SportId = t.SportId,
Players = t.Players.Select(p => new PlayerDTO()
{
Id = p.Id,
FirstName = p.FirstName,
DateOfBirth = p.DateOfBirth,
LastName = p.LastName,
TeamId = p.TeamId
}).ToList()
}).ToList();
EF "Async" with Select into DTO objects
await context.Players.Select(p => new PlayerDTO()
{
Id = p.Id,
FirstName = p.FirstName,
DateOfBirth = p.DateOfBirth,
LastName = p.LastName,
TeamId = p.TeamId
}).FirstOrDefaultAsync(x => x.Id == id);
await context.Players.Where(x => x.TeamId == teamId).Select(p => new PlayerDTO()
{
Id = p.Id,
FirstName = p.FirstName,
DateOfBirth = p.DateOfBirth,
LastName = p.LastName,
TeamId = p.TeamId
}).ToListAsync();
await context.Teams.Where(x => x.SportId == sportId).Select(t => new TeamDTO()
{
Id = t.Id,
FoundingDate = t.FoundingDate,
Name = t.Name,
SportId = t.SportId,
Players = t.Players.Select(p => new PlayerDTO()
{
Id = p.Id,
FirstName = p.FirstName,
DateOfBirth = p.DateOfBirth,
LastName = p.LastName,
TeamId = p.TeamId
}).ToList()
}).ToListAsync();
my result are quite troublesome i think. mostly because MS is promoting the Async part of EF alot.
My results: (in miliseconds)
Number of Sports: 8, Number of Teams: 30, Number of Players: 100
EntityFrameworkAsyncDTO Results
Run # Player by ID Players per Team Teams per Sport
0 1,46 3,47 35,88
1 1,04 3 33
2 1,02 3,3 33,75
3 1,03 3 31,75
4 1,1 3,27 31,38
EntityFrameworkAsync Results
Run # Player by ID Players per Team Teams per Sport
0 1,17 3,53 57
1 1,01 3 48,62
2 0,99 3,03 47,88
3 1,02 3,07 51
4 1 3,03 48,88
EntityFrameworkDTO Results
Run # Player by ID Players per Team Teams per Sport
0 0,02 3 13,25
1 0,01 2,8 13,12
2 0,15 2,97 13,25
3 0,02 2,9 13,25
4 0,05 2,8 13,12
EntityFramework Results
Run # Player by ID Players per Team Teams per Sport
0 0,01 2,27 28,38
1 0,01 2,4 28,25
2 0 2,13 28,5
3 0,01 2,17 27,5
4 0,01 2,13 29
ADONET Results
Run # Player by ID Players per Team Teams per Sport
0 0 2,03 11,75
1 0 2 12,62
2 0 2 11,38
3 0 2 12,38
4 0 2 11,25
/EDIT I've added the ADO.NET times to the result list as a reference.
My question is: Am i doing something wrong with my queries since the load times are so different ?
In a real world system i have running, i have changed out ALL my Async DB calls to Sync calls, and for what i can see in my statistics the system are seeing a ~50% speed increase of DB calls. This is a system with 100-120 cuncurrent users connected via SignalR, it is very DB heavy.
I think this article explains it in details.
Async is not faster and adds a lot of overhead on top of normal "sync" code. But it allows to use resources better in cases when you are wasting your time waiting (e g high latency on network connection etc)
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